RT Journal Article SR Electronic T1 Physical punishment of children: lessons from 20 years of research JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP 1373 OP 1377 DO 10.1503/cmaj.101314 VO 184 IS 12 A1 Durrant, Joan A1 Ensom, Ron YR 2012 UL http://www.cmaj.ca/content/184/12/1373.abstract AB