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Studies were identified via MEDLINE, and through bibliographies of primary and review articles.
A previously described "snowball" search strategy was also performed in which papers were identified through bibliographies of key studies [ 19].
Further published and unpublished papers were sought by screening through bibliographies of identified articles and writing to authors of identified relevant papers.
As Figure 1 shows, 178 studies were removed from the initial 205 54 on grounds of duplication and 124 because at least one of the four eligibility criteria was not met and 8 were added, following identification through bibliographies and citations.
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It should be noted that 20% of the articles (68 of 338) in this review were identified through bibliography searches and from expert lists.
An additional 11 papers or reports were identified through key author searches, 9 through reviewing bibliographies of identified articles and 52 through the website searches.
Additional studies were identified through searching bibliographies of related publications and through contact with experts.
A search through the bibliographies of the above articles identified a further 3 relevant articles which were also included in the analysis [27, 31, 32, 33].
Additional resources were obtained through the bibliographies of reviewed articles.
Additional references were identified through searching bibliographies of included studies.
Other reports were found through the bibliographies of these articles.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com