Cochrane Database of Systematic ReviewsCDSR is the leading resource for systematic reviews in health care. Includes Cochrane Reviews (the systematic reviews) and protocols for Cochrane Reviews as well as editorials. The CDSR also has occasional supplements.
Part of Wiley's Evidence Based Medicine Reviews collection, a joint production of the National Library of Medicine (NLM) who produce MEDLINE and Reed Elsevier who produce EMBASE. Contributors follow quality control standards to ensure only reports of definite randomized controlled trials or controlled clinical trials are included.
"Epistemonikos is a collaborative, multilingual database of health evidence. It is the largest source of systematic reviews relevant for health-decision making, and a large source of other types of scientific evidence."
UK group whose website includes an "Evidence search" with results from numerous groups and agencies.
TRIPClinical search engine designed to allow users to quickly and easily find and use high-quality research evidence to support their practice and/or care. Also contains other content types including images, videos, patient information leaflets, educational courses and news.