RT Journal Article SR Electronic T1 Treating postoperative pain? Avoid tramadol, long-acting opioid analgesics and long-term use JF BMJ Evidence-Based Medicine JO BMJ EBM FD BMJ Publishing Group Ltd SP bmjebm-2019-111236 DO 10.1136/bmjebm-2019-111236 A1 Georgia C Richards YR 2019 UL http://ebm.bmj.com/content/early/2019/08/16/bmjebm-2019-111236.abstract AB