RT Journal Article SR Electronic T1 Fentanyl misuse JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP 673 OP 673 DO 10.1503/cmaj.151378 VO 188 IS 9 A1 Shannon Ruzycki A1 Mark Yarema YR 2016 UL http://www.cmaj.ca/content/188/9/673.abstract