RT Journal Article SR Electronic T1 Tracking opioid use vital to avoiding scourge JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP E129 OP E130 DO 10.1503/cmaj.109-4085 VO 184 IS 2 A1 Paul Christopher Webster YR 2012 UL http://www.cmaj.ca/content/184/2/E129.abstract