Preprints are versions of research articles that appear prior to the completion of full peer review. They are not as extensively validated as peer reviewed publications and so their data or findings should not be used to inform clinical practice. However, the research they contain will be of interest to those seeking the latest or emerging research in their field. Preprints are published on
Preprint Servers, such as those which appear below.
PMC (PubMed Central) has since June 2020 been making certain Preprints openly available on their database.