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Unpublished trials were sought through electronic searches, hand-searching reference lists of relevant reports and discussions with experts in the field.
Studies were identified through electronic searches of PsycINFO, MEDLINE, EMBASE and Web of Knowledge.
Relevant publications were identified through electronic searches on PubMed, WorldCat, and Web of Science using keywords, "cortisol," "hair," "confounders," "chronic," "stress," and "correlates".
Interventions for girls and boys (10 19 years) were identified through electronic searches for peer-reviewed and gray literature such as reports and research briefs.
RCTs in plastic surgery published from 2004 to 2008 were identified through electronic searches, and classified according to their allocation concealment.
Relevant trials were identified through electronic searches of Cochrane Central Register of Controlled Trials, Medline, Embase, and trials registries, handsearching reference lists and citation searches on key publications, and correspondence with manufacturers.
Similar(25)
Among 1,308 initially identified relevant records (940 through electronic searching and 368 through manual searching of the aforementioned journals), 262 unique citations remained after duplicate removal.
Only a small proportion of observational studies are identified through electronic searching [ 13, 14].
To identify more potentially relevant studies, reference lists from selected studies through electronic searching were hand searched.
It is known that observational studies can be difficult to identify through electronic searching [ 7, 8], so reference lists of retrieved studies and reviews were also searched carefully for further reports, together with "linked articles" in PubMed.
In accordance with study protocol, available on request, we included all other publication types of any quantitative or qualitative design, including conference proceedings captured through electronic searching, so as to improve coverage of the grey literature.
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