TY - JOUR T1 - Why should clinical trials be registered? JF - Canadian Medical Association Journal JO - CMAJ SP - 1653 LP - 1653 DO - 10.1503/cmaj.050642 VL - 172 IS - 13 A2 - , Y1 - 2005/06/21 UR - http://www.cmaj.ca/content/172/13/1653.abstract ER -