Grey literature is research not available through traditional commercial publishers. Instead, grey literature is available through government agencies, professional associations, research institutes and more.
Examples of grey literature are unpublished clinical trials, data sets, government and organization reports, conference proceedings, dissertations / theses, patents, preprints, etc.
Include grey literature in evidence syntheses to reduce publication bias and Type I error.
Grey literature is hard to find. The links on this page include some resources and techniques to find grey literature.
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Preprints are reports that have not been certified by peer review. They should not be relied on to guide clinical practice or health-related behavior and should not be reported in news media as established information. (medRxiv)