RT Journal Article SR Electronic T1 Response to “Opioid warning label” JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP E1319 OP E1319 DO 10.1503/cmaj.733337 VO 189 IS 42 A1 Jason W. Busse YR 2017 UL http://www.cmaj.ca/content/189/42/E1319.abstract AB