(To access the first 4 databases below, Citrix login is required if you are NOT within the Eastern Health network. See information on remote access for more details.)
World main portals:
Other main WHO-endorsed Registries of Clinical Trials:
(The links will direct you the search / browse trials page)
The BMJ Advanced Search - for Systematic Reviews, scroll down to Filter "By Article Type" and select "Clinical reviews" or "Views and Reviews".
Grey literature refers to information sources that are beyond the reach of traditional bibliographic databases. Examples of grey literature include theses and dissertations, conference proceedings, government reports, data and statistics, newsletters, technical reports, standards & clinical guidelines, recommendations, presentations and lecture notes.
Grey literature is described as ‘highly desirable’ in the evidence landscape (The Cochrane Collaboration, 2022, see 4.3.5). Grey literature provides a broader perspective on research topics than that provided with only an academic focus. Therefore, it helps reduce publication bias (Paez, 2017) in reviews.
Examples of grey literature sources
Further information on designing search strategies and documenting and reporting the grey literature search can be found here (Severn M, Mierzwinski-Urban M, Farrah K, Walter M, Spry C, Argáez C, 2023).
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