The Cochrane Database of Systematic Reviews
The Cochrane Controlled Trials Register
The Cochrane Database of Methodology Reviews
The Database of Abstracts of Reviews of Effects
The NHS Economic Evaluation Database
The NHS Health Technology Assessment Database
MEDLINE (via Ovid) is a database of citations and abstracts in the fields of medicine, nursing, dentistry, veterinary medicine, health care systems, allied health and preclinical sciences. It contains more than 26 million references from over 5,600 worldwide journals.
Over 19 million citations for biomedical articles back to the 1948. Also includes links to sites providing full text articles and related resources. Mobile access at http://library.queensu.ca/research/guide/health-sciences-multimedia/mobile-apps/mobile-apps-instructions#PubMed
PubMed Health is based on systematic reviews of clinical trials and specializes in reviews of clinical effectiveness research, with easy-to-read summaries for consumers as well as full technical reports.