RT Journal Article SR Electronic T1 Opioid abuse JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP 418 OP 418 DO 10.1503/cmaj.113-2108 VO 185 IS 5 A1 Joel Lexchin YR 2013 UL http://www.cmaj.ca/content/185/5/418.2.abstract AB