TY - JOUR T1 - Registration requirements JF - Canadian Medical Association Journal JO - CMAJ SP - 69 LP - 70 DO - 10.1503/cmaj.1060207 VL - 176 IS - 1 AU - Marianne Willis Y1 - 2007/01/02 UR - http://www.cmaj.ca/content/176/1/69.3.abstract ER -