Cochrane Central Register of Controlled Trials

only 12 concurrent users for the Evidence-Based Medicine Reviews collection for all Ontario (this Cochrane being a part of EBMR)...over 300,000 bibliographic references to controlled trials in health care together with references to clinical trials identified by contributors to the Cochrane Collaboration. Contributors follow quality control standards to ensure that only reports of definite randomized controlled trials or controlled clinical trials are included. These controlled trials included were identified by the contributors to the Cochrane Collaboration to create an unbiased source of data for systematic reviews. Coverage from 1991-present.