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<meta name="description" content="A minority of Cochrane reviews include "unpublished trials" and many of these are eventually published. Truly unpublished studies have poor or unclear methodological quality. Therefore, it may be better to invest in regular updating of reviews, rather than in extensive searching for unpublished data …"><meta name="keywords" content="pmid:19128939, doi:10.1016/j.jclinepi.2008.09.010, Mieke L van Driel, An De Sutter, Thierry Christiaens, Bibliometrics, Controlled Clinical Trials as Topic / standards, Controlled Clinical Trials as Topic / statistics & numerical data*, Databases, Bibliographic, Humans, Meta-Analysis as Topic, Publication Bias, Publishing / statistics & numerical data*, Research Design / standards, Review Literature as Topic*, PubMed Abstract, NIH, NLM, NCBI, National Institutes of Health, National Center for Biotechnology Information, National Library of Medicine, MEDLINE"><meta name="robots" content="index,nofollow,noarchive"><meta property="og:title" content="Searching for unpublished trials in Cochrane reviews may not be worth the effort - PubMed"><meta property="og:url" content="https://pubmed.ncbi.nlm.nih.gov/19128939/"><meta property="og:description" content="A minority of Cochrane reviews include "unpublished trials" and many of these are eventually published. Truly unpublished studies have poor or unclear methodological quality. Therefore, it may be better to invest in regular updating of reviews, rather than in extensive searching for unpublished data …"><meta property="og:image" content="https://cdn.ncbi.nlm.nih.gov/pubmed/persistent/pubmed-meta-image-v2.jpg"><meta property="og:image:secure_url" content="https://cdn.ncbi.nlm.nih.gov/pubmed/persistent/pubmed-meta-image-v2.jpg"><meta property="og:type" content="website"><meta property="og:site_name" content="PubMed"><meta name="twitter:domain" content="pubmed.ncbi.nlm.nih.gov"><meta name="twitter:card" content="summary_large_image"><meta name="twitter:title" content="Searching for unpublished trials in Cochrane reviews may not be worth the effort - PubMed"><meta name="twitter:url" content="https://pubmed.ncbi.nlm.nih.gov/19128939/"><meta name="twitter:description" content="A minority of Cochrane reviews include "unpublished trials" and many of these are eventually published. Truly unpublished studies have poor or unclear methodological quality. Therefore, it may be better to invest in regular updating of reviews, rather than in extensive searching for unpublished data …"><meta name="twitter:image" content="https://cdn.ncbi.nlm.nih.gov/pubmed/persistent/pubmed-meta-image-v2.jpg">
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|
||
<div class="actions-container">
|
||
<div class="return-to-search">
|
||
|
||
|
||
</div>
|
||
|
||
<div class="multiple-results-actions " role="region" aria-label="save, email, send to">
|
||
<button id="save-results-panel-trigger"
|
||
type="button"
|
||
class="save-results save-results-panel-trigger"
|
||
aria-expanded="false"
|
||
aria-controls="save-action-panel"
|
||
data-ga-category="save_share"
|
||
data-ga-action="save"
|
||
data-ga-label="open">
|
||
Save
|
||
</button><button id="email-results-panel-trigger"
|
||
type="button"
|
||
class="email-results email-results-panel-trigger"
|
||
aria-expanded="false"
|
||
aria-controls="email-action-panel"
|
||
data-ga-category="save_share"
|
||
data-ga-action="email"
|
||
data-ga-label="open">
|
||
Email
|
||
</button><div class="more-actions dropdown-block"><button id="more-actions-trigger"
|
||
type="button"
|
||
class="trigger more-actions-trigger"
|
||
ref="linksrc=show_moreactions_btn"
|
||
aria-label="Send to"
|
||
aria-controls="more-actions-dropdown">Send to</button><div id="more-actions-dropdown" class="dropdown dropdown-container" hidden><div class="content"><ul class="more-actions-links"><li><a class="clipboard-panel-trigger dropdown-block-link "
|
||
href="#"
|
||
role="button"
|
||
data-ga-category="save_share"
|
||
data-ga-action="clipboard"
|
||
data-ga-label="send">
|
||
Clipboard
|
||
</a></li><li><a role="button" class="dropdown-block-link bibliography-trigger-target" href="https://account.ncbi.nlm.nih.gov/?back_url=https%3A%2F%2Fpubmed.ncbi.nlm.nih.gov%2F19128939%2F%23open-bibliography-panel">My Bibliography</a></li><li><a role="button" class="dropdown-block-link collections-trigger-target" href="https://account.ncbi.nlm.nih.gov/?back_url=https%3A%2F%2Fpubmed.ncbi.nlm.nih.gov%2F19128939%2F%23open-collections-panel">Collections</a></li><li><a role="button" class="citation-manager-panel-trigger dropdown-block-link citation-manager-trigger-target" href="#">Citation manager</a></li></ul></div></div></div>
|
||
</div>
|
||
|
||
|
||
|
||
<div class="display-options" data-format-key="format"
|
||
data-default-format-value="abstract"
|
||
data-current-format-value="abstract" role="region">
|
||
<button
|
||
class="trigger usa-button"
|
||
title="Change format"
|
||
data-ga-category="display_options"
|
||
data-ga-action="display_options_dialog">
|
||
<span class="button-label">Display options</span>
|
||
</button>
|
||
|
||
<div class="dropdown" hidden>
|
||
<div class="title">
|
||
Display options
|
||
</div>
|
||
|
||
<div class="content">
|
||
|
||
<div class="format-container">
|
||
<span class="option-label">
|
||
Format
|
||
</span>
|
||
<select name="format" data-initial-value="abstract" aria-label="Display format" id="article-display-format">
|
||
<option value="abstract">Abstract</option>
|
||
|
||
<option value="pubmed">PubMed</option>
|
||
|
||
<option value="pmid">PMID</option>
|
||
|
||
</select>
|
||
</div>
|
||
|
||
</div>
|
||
</div>
|
||
</div>
|
||
<input type="hidden" name="csrfmiddlewaretoken" value="KVzg0XuhZkrbNFFvqUKw4NOA903EjsdN1IjlDNXDzVeFH6Ll3dnyyVkeH4LQc3L7">
|
||
</div>
|
||
</div>
|
||
</div>
|
||
|
||
<div id="article-panels-container" class="article-panels-container">
|
||
<div id="save-action-panel" class="save-action-panel action-panel" aria-hidden="true">
|
||
<div class="inner-wrap">
|
||
<h2 class="action-panel-heading">
|
||
Save citation to file
|
||
</h2>
|
||
<form id="save-action-panel-form"
|
||
class="action-panel-content action-form"
|
||
action="/results-export-ids/"
|
||
data-by-search-action="/results-export-search-data/"
|
||
data-by-ids-action="/results-export-ids/"
|
||
method="post"
|
||
data-by-search-method="post"
|
||
data-by-ids-method="post">
|
||
|
||
<input type="hidden" name="csrfmiddlewaretoken" value="KVzg0XuhZkrbNFFvqUKw4NOA903EjsdN1IjlDNXDzVeFH6Ll3dnyyVkeH4LQc3L7">
|
||
|
||
|
||
|
||
<div class="action-panel-control-wrap">
|
||
<label for="save-action-format" class="action-panel-label">
|
||
Format:
|
||
</label>
|
||
<select id="save-action-format" name="results-format" class="action-panel-selector">
|
||
<option value="summary-text">Summary (text)</option>
|
||
<option value="pubmed-text">PubMed</option>
|
||
<option value="pmid">PMID</option>
|
||
<option value="abstract">Abstract (text)</option>
|
||
<option value="csv">CSV</option>
|
||
</select>
|
||
</div>
|
||
|
||
<div class="action-panel-actions">
|
||
<button class="action-panel-submit"
|
||
type="submit"
|
||
data-loading-label="Saving..."
|
||
data-ga-category="save_share"
|
||
data-ga-action="save"
|
||
data-ga-label="save">
|
||
Create file
|
||
</button>
|
||
<button class="action-panel-cancel"
|
||
aria-label="Close 'Save citations to file' panel"
|
||
ref="linksrc=close_save_panel"
|
||
aria-controls="save-action-panel"
|
||
aria-expanded="false"
|
||
data-ga-category="save_share"
|
||
data-ga-action="save"
|
||
data-ga-label="cancel">
|
||
Cancel
|
||
</button>
|
||
</div>
|
||
</form>
|
||
</div>
|
||
</div>
|
||
|
||
|
||
|
||
|
||
<div id="email-action-panel"
|
||
class="email-action-panel action-panel"
|
||
aria-hidden="true"
|
||
data-recaptcha-script-url="https://www.recaptcha.net/recaptcha/enterprise.js?render=explicit&onload=onloadCaptchaCallback"
|
||
data-recaptcha-enabled="true">
|
||
<div class="inner-wrap">
|
||
<h2 class="action-panel-heading">
|
||
Email citation
|
||
</h2>
|
||
<form id="email-action-panel-form"
|
||
class="action-panel-content action-form"
|
||
action="/send-email/"
|
||
data-by-search-action="/results-export-email-by-search-data/"
|
||
data-by-ids-action="/send-email/"
|
||
data-by-search-method="post"
|
||
data-by-ids-method="post"
|
||
method="post"
|
||
>
|
||
<input type="hidden" name="csrfmiddlewaretoken" value="KVzg0XuhZkrbNFFvqUKw4NOA903EjsdN1IjlDNXDzVeFH6Ll3dnyyVkeH4LQc3L7">
|
||
|
||
<div class="action-panel-control-wrap">
|
||
<span class="action-panel-label">
|
||
Subject:
|
||
</span>
|
||
<span class="email-subject" id="email-subject" aria-label="Email subject">1 selected item: 19128939 - PubMed</span>
|
||
<input type="hidden" name="email-subject" value="1 selected item: 19128939"/>
|
||
<input type="hidden" name="email-subject-hash" value="80682a006b840687e9a1fdcdb297be64c604e7024f0e594d592ddf2c94cdc2d1"/>
|
||
</div>
|
||
|
||
<div class="action-panel-control-wrap">
|
||
<label for="email-to" class="action-panel-label required-field-asterisk">
|
||
To:
|
||
</label>
|
||
<input type="email" aria-label="Recipient Email Address" placeholder="email@example.com" id="email-to" class="email-to" pattern="^[a-zA-Z0-9_.+-]+@[a-zA-Z0-9-]+\.[a-zA-Z0-9-.]+$" maxlength="100" required>
|
||
</div>
|
||
|
||
<div class="action-panel-control-wrap">
|
||
<label for="email-from" class="action-panel-label">
|
||
From:
|
||
</label>
|
||
<input type="email" aria-label="Sender Email Address" placeholder="email@example.com" id="email-from" class="email-from" pattern="^[a-zA-Z0-9_.+-]+@[a-zA-Z0-9-]+\.[a-zA-Z0-9-.]+$" maxlength="256">
|
||
</div>
|
||
|
||
|
||
|
||
<div class="action-panel-control-wrap">
|
||
<label for="email-citation-format" class="action-panel-label">
|
||
Format:
|
||
</label>
|
||
<select id="email-citation-format" name="citation-format" class="action-panel-selector email-citation-format">
|
||
<option selected="selected" value="summary">Summary</option>
|
||
<option value="summary-text">Summary (text)</option>
|
||
<option value="abstract">Abstract</option>
|
||
<option value="abstract-text">Abstract (text)</option>
|
||
|
||
</select>
|
||
</div>
|
||
<div class="include-supplemental-container">
|
||
<input type="checkbox" aria-label="Include MeSH and other data" name="include-supplemental" id="email-include-supplemental" class="email-include-supplemental">
|
||
<label for="email-include-supplemental" class="email-include-supplemental-label">MeSH and other data</label>
|
||
</div>
|
||
|
||
|
||
|
||
<div class="form-field recaptcha ">
|
||
|
||
|
||
|
||
<div class="g-recaptcha" id="id-recaptcha" data-sitekey="6LfsWHMdAAAAAClKbtOpjQ2pMjgsGxvv7NdZW9uI"></div>
|
||
|
||
|
||
|
||
|
||
|
||
</div>
|
||
<div id="captcha-error-message" class="usa-input-error-message captcha-validation-message" role="alert"></div>
|
||
|
||
|
||
|
||
<div class="action-panel-actions">
|
||
<button class="action-panel-submit"
|
||
type="submit"
|
||
data-loading-label="Sending..."
|
||
data-ga-category="save_share"
|
||
data-ga-action="email"
|
||
data-ga-label="send">
|
||
Send email
|
||
</button>
|
||
<button class="action-panel-cancel"
|
||
aria-label="Close 'Email citations' panel"
|
||
ref="linksrc=close_email_panel"
|
||
aria-controls="email-action-panel"
|
||
aria-expanded="false"
|
||
data-ga-category="save_share"
|
||
data-ga-action="email"
|
||
data-ga-label="cancel">
|
||
Cancel
|
||
</button>
|
||
</div>
|
||
<input type="hidden" name="email-search-details" value="" />
|
||
<input type="hidden" name="email-search-details-hash" value="0e42663a6c3bd85498fcb88798998fed7bfdc45d457db35281e41afe13cc0524" />
|
||
</form>
|
||
</div>
|
||
</div>
|
||
|
||
<div id="collections-action-panel"
|
||
class="collections-action-panel action-panel in-progress-dots-panel"
|
||
aria-hidden="true"
|
||
data-collections-open-panel-enabled="false"
|
||
data-collections-open-panel-url-hash="#open-collections-panel">
|
||
<div class="inner-wrap">
|
||
<h3 class="action-panel-heading">
|
||
Add to Collections
|
||
</h3>
|
||
|
||
|
||
<form id="collections-action-panel-form"
|
||
class="collections-action-panel-form action-panel-content action-form action-panel-smaller-selectors"
|
||
data-existing-collections-url="/list-existing-collections/"
|
||
data-add-to-existing-collection-url="/add-to-existing-collection/"
|
||
data-create-and-add-to-new-collection-url="/create-and-add-to-new-collection/"
|
||
data-get-article-ids-by-search-url="/get-article-ids-by-search/"
|
||
data-myncbi-max-collection-name-length="100"
|
||
data-add-to-collection-max-amount="1000"
|
||
data-collections-root-url="https://www.ncbi.nlm.nih.gov/myncbi/collections/">
|
||
|
||
<input type="hidden" name="csrfmiddlewaretoken" value="KVzg0XuhZkrbNFFvqUKw4NOA903EjsdN1IjlDNXDzVeFH6Ll3dnyyVkeH4LQc3L7">
|
||
|
||
|
||
|
||
<div class="choice-group" role="radiogroup">
|
||
<ul class="radio-group-items">
|
||
<li>
|
||
<input type="radio"
|
||
id="collections-action-panel-new"
|
||
class="collections-new"
|
||
name="collections"
|
||
value="new"
|
||
data-ga-category="save_share"
|
||
data-ga-action="collections"
|
||
data-ga-label="collections_radio_new">
|
||
<label for="collections-action-panel-new">Create a new collection</label>
|
||
</li>
|
||
<li>
|
||
<input type="radio"
|
||
id="collections-action-panel-existing"
|
||
class="collections-existing"
|
||
name="collections"
|
||
value="existing"
|
||
checked="true"
|
||
data-ga-category="save_share"
|
||
data-ga-action="collections"
|
||
data-ga-label="collections_radio_existing">
|
||
<label for="collections-action-panel-existing">Add to an existing collection</label>
|
||
</li>
|
||
</ul>
|
||
</div>
|
||
|
||
<div class="controls-wrapper">
|
||
<div class="action-panel-control-wrap new-collections-controls">
|
||
<label for="collections-action-panel-add-to-new" class="action-panel-label required-field-asterisk">
|
||
Name your collection:
|
||
</label>
|
||
<input
|
||
type="text"
|
||
name="add-to-new-collection"
|
||
id="collections-action-panel-add-to-new"
|
||
class="collections-action-add-to-new"
|
||
pattern="[^"&=<>\/]*" title="The following characters are not allowed in the Name field: "&=<>/"
|
||
maxlength="100"
|
||
data-ga-category="save_share"
|
||
data-ga-action="create_collection"
|
||
data-ga-label="non_favorties_collection">
|
||
<div class="collections-new-name-too-long usa-input-error-message selection-validation-message">
|
||
Name must be less than 100 characters
|
||
</div>
|
||
</div>
|
||
<div class="action-panel-control-wrap existing-collections-controls">
|
||
<label for="collections-action-panel-add-to-existing" class="action-panel-label">
|
||
Choose a collection:
|
||
</label>
|
||
<select id="collections-action-panel-add-to-existing"
|
||
class="action-panel-selector collections-action-add-to-existing"
|
||
data-ga-category="save_share"
|
||
data-ga-action="select_collection"
|
||
data-ga-label="($('#collections-action-add-to-existing').val() === 'Favorites') ? 'Favorites' : 'non_favorites_collection'">
|
||
</select>
|
||
<div class="collections-retry-load-on-error usa-input-error-message selection-validation-message">
|
||
Unable to load your collection due to an error<br>
|
||
<a href="#">Please try again</a>
|
||
</div>
|
||
</div>
|
||
</div>
|
||
|
||
<div class="action-panel-actions">
|
||
<button class="action-panel-submit"
|
||
type="submit"
|
||
data-loading-label="Adding..."
|
||
data-pinger-ignore
|
||
data-ga-category="save_share"
|
||
data-ga-action="collections"
|
||
data-ga-label="add">
|
||
Add
|
||
</button>
|
||
<button class="action-panel-cancel"
|
||
aria-label="Close 'Add to Collections' panel"
|
||
ref="linksrc=close_collections_panel"
|
||
aria-controls="collections-action-panel"
|
||
aria-expanded="false"
|
||
data-ga-category="save_share"
|
||
data-ga-action="collections"
|
||
data-ga-label="cancel">
|
||
Cancel
|
||
</button>
|
||
</div>
|
||
</form>
|
||
</div>
|
||
</div>
|
||
|
||
<div id="bibliography-action-panel"
|
||
class="bibliography-action-panel action-panel in-progress-dots-panel"
|
||
aria-hidden="true"
|
||
data-bibliography-open-panel-enabled="false"
|
||
data-bibliography-open-panel-url-hash="#open-bibliography-panel">
|
||
<div class="inner-wrap">
|
||
<h3 class="action-panel-heading">
|
||
Add to My Bibliography
|
||
</h3>
|
||
<form id="bibliography-action-panel-form"
|
||
class="bibliography-action-panel-form action-panel-content action-form action-panel-smaller-selectors"
|
||
data-add-to-bibliography-max-amount="100"
|
||
data-add-to-bibliography-batch-size="10"
|
||
data-bibliography-delegates-url="/list-bibliography-delegates/"
|
||
data-add-to-bibliography-url="/add-to-bibliography/"
|
||
data-get-article-ids-by-search-url="/get-article-ids-by-search/"
|
||
data-mybib-root-url="https://www.ncbi.nlm.nih.gov/myncbi/collections/mybibliography/">
|
||
|
||
<input type="hidden" name="csrfmiddlewaretoken" value="KVzg0XuhZkrbNFFvqUKw4NOA903EjsdN1IjlDNXDzVeFH6Ll3dnyyVkeH4LQc3L7">
|
||
|
||
|
||
|
||
<div class="action-panel-control-wrap bibliographies-controls">
|
||
<div class="choice-group">
|
||
<ul class="bibliographies-action-add radio-group-items">
|
||
<li>
|
||
<input name="bibliography" id="my-bibliography" class="my-bibliography" type="radio" checked/>
|
||
<label for="my-bibliography">My Bibliography</label>
|
||
</li>
|
||
</ul>
|
||
</div>
|
||
</div>
|
||
|
||
<div class="bibliographies-retry-load-on-error usa-input-error-message selection-validation-message">
|
||
Unable to load your delegates due to an error<br>
|
||
<a href="#">Please try again</a>
|
||
</div>
|
||
|
||
<div class="action-panel-actions">
|
||
<button class="action-panel-submit"
|
||
type="submit"
|
||
data-loading-label="Adding..."
|
||
data-pinger-ignore>
|
||
Add
|
||
</button>
|
||
<button class="action-panel-cancel"
|
||
aria-label="Close 'Add to bibliography' panel"
|
||
ref="linksrc=close_bibliography_panel"
|
||
aria-controls="bibliography-action-panel"
|
||
aria-expanded="false"
|
||
data-ga-category="save_share"
|
||
data-ga-action="mybib"
|
||
data-ga-label="cancel">
|
||
Cancel
|
||
</button>
|
||
</div>
|
||
</form>
|
||
</div>
|
||
</div>
|
||
|
||
|
||
|
||
|
||
<div id="saved-search-action-panel" class="saved-search-action-panel action-panel " aria-hidden="true"
|
||
data-saved-search-open-panel-enabled="false"
|
||
data-saved-search-open-panel-url-hash="#open-saved-search-panel">
|
||
<div class="inner-wrap">
|
||
<h2 class="action-panel-heading">
|
||
Your saved search
|
||
</h2>
|
||
|
||
<form id="saved-search-action-panel-form"
|
||
class="saved-search-action-panel-form action-panel-content action-form"
|
||
data-create-saved-search-url="/create-saved-search/"
|
||
data-try-search-terms-url="/try-search-term/"
|
||
data-saved-search-root-url="https://www.ncbi.nlm.nih.gov/myncbi/searches/">
|
||
|
||
<input type="hidden" name="csrfmiddlewaretoken" value="KVzg0XuhZkrbNFFvqUKw4NOA903EjsdN1IjlDNXDzVeFH6Ll3dnyyVkeH4LQc3L7">
|
||
|
||
<div class="action-panel-control-wrap">
|
||
<label for="saved-search-name" class="action-panel-label saved-search-name-label required-field-asterisk">
|
||
Name of saved search:
|
||
</label>
|
||
<input maxlength="200"
|
||
type="text"
|
||
name="saved-search-name"
|
||
id="saved-search-name"
|
||
class="saved-search-name"
|
||
value=""
|
||
required
|
||
pattern="[^"&=<>\/]*" title="The following characters are not allowed in the Name field: "&=<>/">
|
||
</div>
|
||
|
||
<div class="action-panel-control-wrap">
|
||
<label for="saved-search-term" class="action-panel-label required-field-asterisk">
|
||
Search terms:
|
||
</label>
|
||
<textarea name="saved-search-term" id="saved-search-term" class="saved-search-term" required></textarea>
|
||
</div>
|
||
<div class="test-search-term-wrap">
|
||
<a href="#" class="try-search-term">Test search terms</a>
|
||
</div>
|
||
<div class="choice-group action-panel-extra-margin-top">
|
||
<span class="action-panel-label" id="fieldset-label">
|
||
Would you like email updates of new search results?
|
||
</span>
|
||
<fieldset id="saved-search-alert" aria-describedby="fieldset-label">
|
||
<legend class="usa-sr-only">Saved Search Alert Radio Buttons</legend>
|
||
<ul class="radio-group-items">
|
||
<li>
|
||
<input type="radio" id="saved-search-alert-yes" class="saved-search-alert-yes" name="saved-search-alert" value="yes" checked>
|
||
<label for="saved-search-alert-yes" class="action-panel-label">Yes</label>
|
||
</li>
|
||
<li>
|
||
<input aria-label="No radio input" type="radio" id="saved-search-alert-no" class="saved-search-alert-no" name="saved-search-alert" value="no">
|
||
<label for="saved-search-alert-no" class="action-panel-label">No</label>
|
||
</li>
|
||
</ul>
|
||
</fieldset>
|
||
</div>
|
||
|
||
<div class="alert-schedule-wrap">
|
||
<div class="action-panel-control-wrap">
|
||
<label class="action-panel-label">
|
||
Email:
|
||
</label>
|
||
<span aria-label="Email address" id="saved-search-email" class="action-panel-label"><span class="action-panel-label-bold"></span> (<a class="myncbi-account-settings" href="https://www.ncbi.nlm.nih.gov/account/settings/">change</a>)</span>
|
||
</div>
|
||
<div class="action-panel-control-wrap action-panel-extra-margin-top">
|
||
<label for="saved-search-frequency" class="action-panel-label">
|
||
Frequency:
|
||
</label>
|
||
<select id="saved-search-frequency" class="no-border-panel-selector saved-search-frequency">
|
||
<option value="monthly">Monthly</option>
|
||
<option value="weekly">Weekly</option>
|
||
<option value="daily">Daily</option>
|
||
</select>
|
||
</div>
|
||
<div class="action-panel-control-wrap saved-search-monthly-additional">
|
||
<label for="saved-search-monthly-on-day" class="action-panel-label">
|
||
Which day?
|
||
</label>
|
||
<select id="saved-search-monthly-on-day" class="no-border-panel-selector">
|
||
<option value="Sunday">The first Sunday</option>
|
||
<option value="Monday">The first Monday</option>
|
||
<option value="Tuesday">The first Tuesday</option>
|
||
<option value="Wednesday">The first Wednesday</option>
|
||
<option value="Thursday">The first Thursday</option>
|
||
<option value="Friday">The first Friday</option>
|
||
<option value="Saturday">The first Saturday</option>
|
||
<option value="day">The first day</option>
|
||
<option value="weekday">The first weekday</option>
|
||
</select>
|
||
</div>
|
||
<div class="action-panel-control-wrap saved-search-weekly-additional">
|
||
<label for="saved-search-weekly-on-day" class="action-panel-label">
|
||
Which day?
|
||
</label>
|
||
<select id="saved-search-weekly-on-day" class="no-border-panel-selector saved-search-weekly-on-day">
|
||
<option value="Sunday">Sunday</option>
|
||
<option value="Monday">Monday</option>
|
||
<option value="Tuesday">Tuesday</option>
|
||
<option value="Wednesday">Wednesday</option>
|
||
<option value="Thursday">Thursday</option>
|
||
<option value="Friday">Friday</option>
|
||
<option value="Saturday">Saturday</option>
|
||
</select>
|
||
</div>
|
||
<div class="action-panel-control-wrap">
|
||
<label for="saved-search-report" class="action-panel-label">
|
||
Report format:
|
||
</label>
|
||
<select id="saved-search-report" class="no-border-panel-selector saved-search-report">
|
||
<option value="DocSum">Summary</option>
|
||
<option value="DocSumText">Summary (text)</option>
|
||
<option value="Abstract">Abstract</option>
|
||
<option value="AbstractText">Abstract (text)</option>
|
||
<option value="MEDLINE">PubMed</option>
|
||
</select>
|
||
</div>
|
||
<div class="action-panel-control-wrap">
|
||
<label for="saved-search-amount" class="action-panel-label">
|
||
Send at most:
|
||
</label>
|
||
<select id="saved-search-amount" class="no-border-panel-selector saved-search-amount">
|
||
<option value="1">1 item</option>
|
||
<option value="5" selected>5 items</option>
|
||
<option value="10">10 items</option>
|
||
<option value="20">20 items</option>
|
||
<option value="50">50 items</option>
|
||
<option value="100">100 items</option>
|
||
<option value="200">200 items</option>
|
||
</select>
|
||
</div>
|
||
<div>
|
||
<input type="checkbox" id="saved-search-send-if-no-result" class="saved-search-send-if-no-result" name="saved-search-send-if-no-result">
|
||
<label for="saved-search-send-if-no-result" class="action-panel-label smaller-checkbox">
|
||
Send even when there aren't any new results
|
||
</label>
|
||
</div>
|
||
<div class="action-panel-control-wrap option-text-in-email-wrap">
|
||
<label for="saved-search-email-text" class="action-panel-label">
|
||
Optional text in email:
|
||
</label>
|
||
<textarea name="saved-search-email-text"
|
||
id="saved-search-email-text"
|
||
class="saved-search-email-text"></textarea>
|
||
</div>
|
||
|
||
</div>
|
||
|
||
<div class="action-panel-actions">
|
||
<button class="action-panel-submit"
|
||
type="submit"
|
||
data-loading-label="Saving..."
|
||
data-ga-category="save_share"
|
||
data-ga-action="alert"
|
||
data-ga-label="save">
|
||
Save
|
||
</button>
|
||
<button class="action-panel-cancel"
|
||
aria-label="Close 'Your saved search' panel"
|
||
ref="linksrc=close_saved_search_panel"
|
||
aria-controls="saved-search-action-panel"
|
||
aria-expanded="false"
|
||
data-ga-category="save_share"
|
||
data-ga-action="alert"
|
||
data-ga-label="cancel">
|
||
Cancel
|
||
</button>
|
||
</div>
|
||
</form>
|
||
</div>
|
||
</div>
|
||
|
||
<div id="citation-manager-action-panel" class="citation-manager-action-panel action-panel" aria-hidden="true">
|
||
<div class="inner-wrap">
|
||
<h2 class="action-panel-heading">
|
||
Create a file for external citation management software
|
||
</h2>
|
||
<form id="citation-manager-action-panel-form"
|
||
class="action-panel-content action-form"
|
||
action="/results-export-ids/"
|
||
data-by-search-action="/results-export-search-data/"
|
||
data-by-ids-action="/results-export-ids/"
|
||
method="post"
|
||
data-by-search-method="post"
|
||
data-by-ids-method="post">
|
||
|
||
<input type="hidden" name="csrfmiddlewaretoken" value="KVzg0XuhZkrbNFFvqUKw4NOA903EjsdN1IjlDNXDzVeFH6Ll3dnyyVkeH4LQc3L7">
|
||
|
||
|
||
|
||
<input name="results-format" type="hidden" value="pubmed"/>
|
||
|
||
<div class="action-panel-actions">
|
||
<button class="action-panel-submit"
|
||
type="submit"
|
||
data-loading-label="Sending..."
|
||
data-ga-category="save_share"
|
||
data-ga-action="citation_manager"
|
||
data-ga-label="save">
|
||
Create file
|
||
</button>
|
||
<button class="action-panel-cancel"
|
||
aria-label="Close 'Send citations to citation manager' panel"
|
||
ref="linksrc=close_citation_manager_panel"
|
||
aria-controls="citation-manager-action-panel"
|
||
aria-expanded="false"
|
||
data-ga-category="save_share"
|
||
data-ga-action="citation_manager"
|
||
data-ga-label="cancel">
|
||
Cancel
|
||
</button>
|
||
</div>
|
||
</form>
|
||
</div>
|
||
</div>
|
||
|
||
|
||
|
||
|
||
<div id="rss-action-panel" class="rss-action-panel action-panel " aria-hidden="true">
|
||
<div class="inner-wrap">
|
||
<h2 class="action-panel-heading">
|
||
Your RSS Feed
|
||
</h2>
|
||
|
||
<form id="rss-action-panel-form"
|
||
class="rss-action-panel-form action-panel-content action-form"
|
||
data-create-rss-feed-url="/create-rss-feed-url/"
|
||
data-search-form-term-value="">
|
||
|
||
<input type="hidden" name="csrfmiddlewaretoken" value="KVzg0XuhZkrbNFFvqUKw4NOA903EjsdN1IjlDNXDzVeFH6Ll3dnyyVkeH4LQc3L7">
|
||
|
||
<div class="action-panel-control-wrap">
|
||
<label for="rss-name" class="action-panel-label required-field-asterisk">
|
||
Name of RSS Feed:
|
||
</label>
|
||
<input maxlength="200"
|
||
placeholder="Name"
|
||
type="text"
|
||
name="rss-name"
|
||
id="rss-name"
|
||
class="rss-name"
|
||
value=''
|
||
required
|
||
pattern="[^"&=<>\/]*" title="The following characters are not allowed in the Name field: "&=<>/">
|
||
</div>
|
||
|
||
<div class="rss-limit-wrap">
|
||
<div class="action-panel-control-wrap action-panel-extra-margin-top">
|
||
<label for="rss-limit" class="action-panel-label">
|
||
Number of items displayed:
|
||
</label>
|
||
<select id="rss-limit" class="no-border-panel-selector rss-limit">
|
||
<option value="5">5</option>
|
||
<option value="10">10</option>
|
||
<option value="15" selected="selected">15</option>
|
||
<option value="20">20</option>
|
||
<option value="50">50</option>
|
||
<option value="100">100</option>
|
||
</select>
|
||
</div>
|
||
</div>
|
||
|
||
<div class="action-panel-actions">
|
||
<button class="action-panel-submit"
|
||
type="submit"
|
||
data-loading-label="Creating..."
|
||
data-ga-category="save_share"
|
||
data-ga-action="alert"
|
||
data-ga-label="save">
|
||
Create RSS
|
||
</button>
|
||
<button class="action-panel-cancel"
|
||
aria-label="Close 'Your RSS' panel"
|
||
ref="linksrc=close_rss_panel"
|
||
aria-controls="rss-action-panel"
|
||
aria-expanded="false"
|
||
data-ga-category="save_share"
|
||
data-ga-action="alert"
|
||
data-ga-label="cancel">
|
||
Cancel
|
||
</button>
|
||
</div>
|
||
|
||
<div class="action-panel-control-wrap rss-link-copy-wrap">
|
||
<label for="rss-link" class="usa-sr-only">RSS Link</label>
|
||
<input placeholder="Your RSS Feed Link" type="text" name="rss-link" id="rss-link" class="rss-link" title="RSS Link">
|
||
<button
|
||
type="button"
|
||
disabled
|
||
class="rss-link-copy-button disabled"
|
||
data-ga-category="save_share"
|
||
data-ga-action="rss"
|
||
data-ga-label="copy">
|
||
Copy
|
||
</button>
|
||
</div>
|
||
</form>
|
||
</div>
|
||
</div>
|
||
|
||
</div>
|
||
</div>
|
||
|
||
<div class="article-page" id="article-page" data-article-pmid="19128939">
|
||
<aside class="page-sidebar">
|
||
<div class="inner-wrap">
|
||
|
||
<div class="full-text-links">
|
||
<div class="full-view">
|
||
<h3 class="title">
|
||
Full text links
|
||
</h3>
|
||
<div class="full-text-links-list">
|
||
<a class="link-item
|
||
|
||
dialog-focus"
|
||
href="https://linkinghub.elsevier.com/retrieve/pii/S0895-4356(08)00275-8"
|
||
target="_blank"
|
||
rel="noopener"
|
||
|
||
ref="linksrc=fulltextorjournal_fulltext&is_pmc=False&PrId=3048&itool=Abstract-def&log$=linkouticon&uid=19128939&db=pubmed&nlmid=8801383"
|
||
title="See full text options at Elsevier Science"
|
||
|
||
data-ga-category="full_text"
|
||
data-ga-action="Elsevier Science"
|
||
data-ga-label="19128939"
|
||
><img src="https://cdn.ncbi.nlm.nih.gov/corehtml/query/egifs/https:--linkinghub.elsevier.com-ihub-images-PubMedLink.gif" alt="Elsevier Science full text link"><span class="text">
|
||
|
||
Elsevier Science
|
||
|
||
</span></a>
|
||
</div>
|
||
|
||
</div>
|
||
|
||
<div class="short-view">
|
||
<a href="#" class="full-text-links-button full-text-links-dialog-trigger">
|
||
Full text links
|
||
</a>
|
||
</div>
|
||
</div>
|
||
|
||
|
||
|
||
|
||
<div class="actions-buttons sidebar"><h3 class="title">Actions</h3><div class="inner-wrap"><button class="citation-button citation-dialog-trigger"
|
||
aria-label="Open dialog with citation text in different styles"
|
||
data-ga-category="save_share"
|
||
data-ga-action="cite"
|
||
data-ga-label="open"
|
||
data-all-citations-url="/19128939/citations/"
|
||
data-citation-style="nlm"
|
||
data-pubmed-format-link="/19128939/export/"><span class="button-label">Cite</span></button><link type="text/css" href="ncbi-overlay-block/src/overlay-block.css"><div class="collections-button-container" data-article-id="19128939" data-article-db="pubmed"><button class="collections-button collections-dialog-trigger"
|
||
aria-label="Save article in MyNCBI collections."
|
||
data-ga-category="collections_button"
|
||
data-ga-action="click"
|
||
data-ga-label="collections_button"
|
||
data-collections-open-dialog-enabled="false"
|
||
data-collections-open-dialog-url="https://account.ncbi.nlm.nih.gov/?back_url=https%3A%2F%2Fpubmed.ncbi.nlm.nih.gov%2F19128939%2F%23open-collections-dialog"
|
||
data-in-collections="false"><span class="button-label">Collections</span></button><div class="overlay" role="dialog"><div id="collections-action-dialog"
|
||
class="dialog collections-dialog"
|
||
aria-hidden="true"><div class="title">Add to Collections</div><div class="collections-action-panel action-panel"><form id="collections-action-dialog-form"
|
||
class="collections-action-panel-form action-panel-content action-form action-panel-smaller-selectors"
|
||
data-existing-collections-url="/list-existing-collections/"
|
||
data-add-to-existing-collection-url="/add-to-existing-collection/"
|
||
data-create-and-add-to-new-collection-url="/create-and-add-to-new-collection/"
|
||
data-myncbi-max-collection-name-length="100"
|
||
data-collections-root-url="https://www.ncbi.nlm.nih.gov/myncbi/collections/"><input type="hidden" name="csrfmiddlewaretoken" value="KVzg0XuhZkrbNFFvqUKw4NOA903EjsdN1IjlDNXDzVeFH6Ll3dnyyVkeH4LQc3L7"><div class="choice-group" role="radiogroup"><ul class="radio-group-items"><li><input type="radio"
|
||
id="collections-action-dialog-new"
|
||
class="collections-new"
|
||
name="collections"
|
||
value="new"
|
||
data-ga-category="collections_button"
|
||
data-ga-action="click"
|
||
data-ga-label="collections_radio_new"><label for="collections-action-dialog-new">Create a new collection</label></li><li><input type="radio"
|
||
id="collections-action-dialog-existing"
|
||
class="collections-existing"
|
||
name="collections"
|
||
value="existing"
|
||
checked="true"
|
||
data-ga-category="collections_button"
|
||
data-ga-action="click"
|
||
data-ga-label="collections_radio_existing"><label for="collections-action-dialog-existing">Add to an existing collection</label></li></ul></div><div class="controls-wrapper"><div class="action-panel-control-wrap new-collections-controls"><label for="collections-action-dialog-add-to-new" class="action-panel-label required-field-asterisk">
|
||
Name your collection:
|
||
</label><input
|
||
type="text"
|
||
name="add-to-new-collection"
|
||
id="collections-action-dialog-add-to-new"
|
||
class="collections-action-add-to-new"
|
||
pattern="[^"&=<>\/]*" title="The following characters are not allowed in the Name field: "&=<>/"
|
||
maxlength="100"
|
||
data-ga-category="collections_button"
|
||
data-ga-action="create_collection"
|
||
data-ga-label="non_favorties_collection"><div class="collections-new-name-too-long usa-input-error-message selection-validation-message">
|
||
Name must be less than 100 characters
|
||
</div></div><div class="action-panel-control-wrap existing-collections-controls"><label for="collections-action-dialog-add-to-existing" class="action-panel-label">
|
||
Choose a collection:
|
||
</label><select id="collections-action-dialog-add-to-existing"
|
||
class="action-panel-selector collections-action-add-to-existing"
|
||
data-ga-category="collections_button"
|
||
data-ga-action="select_collection"
|
||
data-ga-label="($('.collections-action-add-to-existing').val() === 'Favorites') ? 'Favorites' : 'non_favorites_collection'"></select><div class="collections-retry-load-on-error usa-input-error-message selection-validation-message">
|
||
Unable to load your collection due to an error<br><a href="#">Please try again</a></div></div></div><div class="action-panel-actions"><button class="action-panel-submit"
|
||
type="submit"
|
||
data-loading-label="Adding..."
|
||
data-pinger-ignore
|
||
data-ga-category="collections_button"
|
||
data-ga-action="click"
|
||
data-ga-label="add">
|
||
Add
|
||
</button><button class="action-panel-cancel"
|
||
aria-label="Close 'Add to Collections' panel"
|
||
ref="linksrc=close_collections_panel"
|
||
aria-controls="collections-action-panel"
|
||
aria-expanded="false"
|
||
data-ga-category="collections_button"
|
||
data-ga-action="click"
|
||
data-ga-label="cancel">
|
||
Cancel
|
||
</button></div></form></div></div></div></div><button class="more-actions-button more-actions-dialog-trigger"
|
||
title="Open dialog with more actions to take"
|
||
ref="linksrc=more_actions_btn"></button><div class="display-options" data-format-key="format"
|
||
data-default-format-value="abstract"
|
||
data-current-format-value="abstract" role="region"><button
|
||
class="trigger usa-button"
|
||
title="Change format"
|
||
data-ga-category="display_options"
|
||
data-ga-action="display_options_dialog"><span class="button-label">Display options</span></button><div class="dropdown" hidden><div class="title">
|
||
Display options
|
||
</div><div class="content"><div class="format-container"><span class="option-label">
|
||
Format
|
||
</span><select name="format" data-initial-value="abstract" aria-label="Display format" id="sidebar-actions-display-format"><option value="abstract">Abstract</option><option value="pubmed">PubMed</option><option value="pmid">PMID</option></select></div></div></div></div></div></div>
|
||
|
||
<div class="social-sharing">
|
||
<h3 class="title">
|
||
Share
|
||
</h3>
|
||
<ul class="social-sharing-links usa-unstyled-list">
|
||
|
||
|
||
<li>
|
||
<a href="http://twitter.com/intent/tweet?text=Searching%20for%20unpublished%20trials%20in%20Cochrane%20reviews%20may%20not%20be%20worth%20the%20effort%20https%3A//pubmed.ncbi.nlm.nih.gov/19128939/"
|
||
class="share-link share-link-twitter"
|
||
rel="noreferrer noopener"
|
||
target="Pubmed-Social-Media-Share-Popup"
|
||
title="Share article on Twitter"
|
||
data-ga-category="save_share"
|
||
data-ga-action="social"
|
||
data-ga-label="twitter"></a>
|
||
</li>
|
||
<li>
|
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Searching for unpublished trials in Cochrane reviews may not be worth the effort
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Searching for unpublished trials in Cochrane reviews may not be worth the effort
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</a></li></ul></div></div></div><span class="period">. </span><span class="cit">2009 Aug;62(8):838-844.e3.</span>
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<span class="citation-doi">
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doi: 10.1016/j.jclinepi.2008.09.010.
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</span>
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<span class="secondary-date">
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Epub 2009 Jan 6.
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</span>
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<li data-affiliation-id="short-view-affiliation-1"
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id="short-view-affiliation-1"
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><sup class="key">1</sup> Department of General Practice and Primary Health Care, Ghent University, Belgium. mieke_vandriel@bond.edu.au</li>
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<span class="identifier pubmed">
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<span class="id-label">
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PMID:
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<strong class="current-id" title="PubMed ID">19128939</strong>
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|
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|
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<strong class="sub-title">
|
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Objective:
|
||
</strong>
|
||
|
||
To assess the value of searching for unpublished data by exploring the extent to which Cochrane reviews include unpublished data and by evaluating the quality of unpublished trials.
|
||
</p>
|
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<p>
|
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|
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<strong class="sub-title">
|
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Study design and setting:
|
||
</strong>
|
||
|
||
We screened all 2,462 completed Cochrane reviews published since 2000 in the Cochrane Database of Systematic Reviews Issue 3, 2006. In a random sample (n=61) of 292 reviews, including unpublished trials, we studied all 116 references.
|
||
</p>
|
||
|
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<p>
|
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|
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<strong class="sub-title">
|
||
Results:
|
||
</strong>
|
||
|
||
Unpublished trials make up 8.8% of all included trials in our sample. Thirty-eight percent of the "unpublished" trials have in fact been published. Allocation concealment was "unclear" or not adequate in 54.3% and 61.3% reported blinding. In 47.2% reported withdrawal rates were >20%. Trials that were eventually published had larger mean population sizes (P-value, 0.02). Of the reported sponsors, 87.3% were drug companies. Methodological quality and publication bias are mentioned in half of the reviews and explored in a third. Quality ratings did not have consequences for pooling, because 82.8% was included in the forest plots.
|
||
</p>
|
||
|
||
|
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|
||
|
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<strong class="sub-title">
|
||
Conclusions:
|
||
</strong>
|
||
|
||
A minority of Cochrane reviews include "unpublished trials" and many of these are eventually published. Truly unpublished studies have poor or unclear methodological quality. Therefore, it may be better to invest in regular updating of reviews, rather than in extensive searching for unpublished data.
|
||
</p>
|
||
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Different antibiotic treatments for group A streptococcal pharyngitis.
|
||
|
||
</a>
|
||
<div class="docsum-citation full-citation">
|
||
|
||
|
||
|
||
<span class="docsum-authors full-authors">van Driel ML, De Sutter AI, Habraken H, Thorning S, Christiaens T.</span>
|
||
|
||
|
||
|
||
<span class="docsum-authors short-authors">van Driel ML, et al.</span>
|
||
<span class="docsum-journal-citation full-journal-citation">Cochrane Database Syst Rev. 2016 Sep 11;9(9):CD004406. doi: 10.1002/14651858.CD004406.pub4.</span>
|
||
<span class="docsum-journal-citation short-journal-citation">Cochrane Database Syst Rev. 2016.</span>
|
||
|
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|
||
|
||
<span class="docsum-comments-correction">
|
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|
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|
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<span class="citation-part">PMID: <span class="docsum-pmid">27614728</span></span>
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<span class="correction-label spaced-citation-item citation-part">Updated.</span>
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<span class="publication-type spaced-citation-item citation-part">Review.</span>
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|
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|
||
|
||
</div>
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||
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||
</li>
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||
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How should systematic reviewers handle conference abstracts? A view from the trenches.
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</a>
|
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<div class="docsum-citation full-citation">
|
||
|
||
|
||
|
||
<span class="docsum-authors full-authors">Scherer RW, Saldanha IJ.</span>
|
||
|
||
|
||
|
||
<span class="docsum-authors short-authors">Scherer RW, et al.</span>
|
||
<span class="docsum-journal-citation full-journal-citation">Syst Rev. 2019 Nov 7;8(1):264. doi: 10.1186/s13643-019-1188-0.</span>
|
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<span class="docsum-journal-citation short-journal-citation">Syst Rev. 2019.</span>
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<span class="citation-part">PMID: <span class="docsum-pmid">31699124</span></span>
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<span class="free-resources spaced-citation-item citation-part">Free PMC article.</span>
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</div>
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</li>
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<a class="docsum-title"
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Association Between Shame and Posttraumatic Stress Disorder: A Meta-Analysis.
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<div class="docsum-citation full-citation">
|
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|
||
|
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<span class="docsum-authors full-authors">López-Castro T, Saraiya T, Zumberg-Smith K, Dambreville N.</span>
|
||
|
||
|
||
|
||
<span class="docsum-authors short-authors">López-Castro T, et al.</span>
|
||
<span class="docsum-journal-citation full-journal-citation">J Trauma Stress. 2019 Aug;32(4):484-495. doi: 10.1002/jts.22411. Epub 2019 Jul 10.</span>
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<span class="docsum-journal-citation short-journal-citation">J Trauma Stress. 2019.</span>
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|
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|
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|
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<span class="docsum-authors full-authors">Cooper C, Booth A, Varley-Campbell J, Britten N, Garside R.</span>
|
||
|
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|
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|
||
<span class="docsum-authors short-authors">Cooper C, et al.</span>
|
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<span class="docsum-journal-citation full-journal-citation">BMC Med Res Methodol. 2018 Aug 14;18(1):85. doi: 10.1186/s12874-018-0545-3.</span>
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<div class="docsum-citation full-citation">
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<span class="docsum-authors full-authors">Romo-Barron CB, Diaz D, Portillo-Loera JJ, Romo-Rubio JA, Jimenez-Trejo F, Montero-Pardo A.</span>
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<span class="docsum-authors short-authors">Romo-Barron CB, et al.</span>
|
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<span class="docsum-journal-citation full-journal-citation">Int J Biometeorol. 2019 Jul;63(7):949-962. doi: 10.1007/s00484-019-01707-z. Epub 2019 Mar 19.</span>
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<span class="citation-part">PMID: <span class="docsum-pmid">30888508</span></span>
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