RT Journal Article SR Electronic T1 Rethinking randomized controlled trials JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP 1178 OP 1178 DO 10.1503/cmaj.081675 VO 179 IS 11 A1 Jeremy Howick, PhD YR 2008 UL http://www.cmaj.ca/content/179/11/1178.abstract