=====Embase===== The most comprehensive, highly versatile, multipurpose and up-to-date [[Bibliographic database]] covering over 28 million indexed records from international biomedical literature, from 1947 to the present day. For further details see [[http://www.elsevier.com/online-tools/embase|About Embase]] from [[Elsevier]] The [[Cochrane Central Register of Controlled Trials]] (CENTRAL) is a highly concentrated source of reports of [[randomized controlled trial]] and quasi-randomised [[controlled trial]]s. The majority of CENTRAL records are taken from bibliographic databases (mainly [[MEDLINE]] and [[Embase]])