RT Journal Article SR Electronic T1 Surgeons as advocates for opioid control JF Canadian Journal of Surgery JO CAN J SURG FD Canadian Medical Association SP 220 OP 221 DO 10.1503/cjs.011419 VO 62 IS 4 A1 Chad G. Ball YR 2019 UL http://canjsurg.ca/content/62/4/220.abstract