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medRxiv - a free online archive and distribution server for complete but unpublished manuscripts (preprints) in the medical, clinical, and related health sciences.
Preprints are preliminary reports of work that have not been certified by peer review.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.
This is a list of OA disciplinary repositories (also called central or subject repositories). Unless otherwise noted, they accept relevant deposits regardless of the author's institutional affiliation.
This list includes both preprint and postprint repositories.