RT Journal Article SR Electronic T1 Prohibition against off-label drug promotion challenged JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP 518 OP 519 DO 10.1503/cmaj.109-4128 VO 184 IS 5 A1 Cal Woodward YR 2012 UL http://www.cmaj.ca/content/184/5/518.abstract