CCTR (formerly Cochrane Controlled Trials Register) is a bibliographic database of definitive controlled trials. CCTR contains over 300,000 bibliographic references to controlled trials in health care. Cochrane groups and other organizations contribute their specialized registers; and these registers—together with references to clinical trials identified in MEDLINE and EMBASE—form the CCTR database. Contributors to the Cochrane Collaboration follow quality control standards to ensure that only reports of definite randomized controlled trials or controlled clinical trials are included.
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