Cochrane Library This link opens in a new windowThe Cochrane Library includes the Cochrane Central Register of Controlled Trials (CENTRAL), a highly concentrated source of reports of randomized and quasi-randomized controlled trials. Most CENTRAL records are taken from bibliographic databases (mainly PubMed and Embase), but records are also derived from other published and unpublished sources, including CINAHL, ClinicalTrials.gov and the WHO's International Clinical Trials Registry Platform.