RT Journal Article SR Electronic T1 Adverse effects of opioids for non-cancer pain JF Drug and Therapeutics Bulletin JO Drug Ther Bull FD BMJ Publishing Group Ltd SP 15 OP 16 DO 10.1136/dtb.2018.2.0583 VO 56 IS 2 YR 2018 UL http://dtb.bmj.com/content/56/2/15.2.abstract AB