The Cochrane library is the best single source of reliable evidence
about the effects of health care interventions. It is comprised of The
Cochrane Database of Systematic Reviews (CDSR), the Database of
Abstracts of Reviews of Effectiveness (DARE), the Cochrane Controlled
Trials Register (CCTR) and the Cochrane Review Methodology Database
(CRMD). Cochrane is produced by the Cochrane Collaboration which is an
international group dedicated to the promotion of best practices in
healthcare by making information about the effect of medical
interventions widely accessible.
Guide to Cochrane Library