RT Journal Article SR Electronic T1 Ontario takes aim at painkiller abuse JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP E141 OP E142 DO 10.1503/cmaj.109-3032 VO 181 IS 8 A1 Ann Silversides YR 2009 UL http://www.cmaj.ca/content/181/8/E141.abstract