Materials are made available free of charge on the understanding that all subsequent reuse is non-commercial and gives due acknowledgement to the source. A programme of workshops to find evidence systematically about clinical effectiveness. The U.S. National Institutes of Health , through its National Library of Medicine , has developed ClinicalTrials.gov to provide patients, family members and members of the public current information about clinical research studies. New reviews are added with each issue of The Cochrane Library . Cochrane reviews are reviews mainly of randomised controlled trials.
Evidence is included or excluded on the basis of explicit quality criteria to minimise bias.
Data are often combined statistically, with meta-analysis, to increase the power of the findings of numerous studies each too small to produce reliable results individually. Although the Cochrane Database of Systematic Reviews is available on subscription only, the Abstracts of Cochrane Reviews are available without charge and can be browsed or searched . The Cochrane Library is an electronic publication designed to supply high quality evidence to inform people providing and receiving care, and those responsible for research, teaching, funding and administration at all levels. It is published quarterly on CD-ROM and the Internet, and is distributed on a subscription basis. This collaboration between the UK Cochrane Centre and the Royal College of Surgeons of Edinburgh brings together many notable studies from the histories of controlled trials.