Berthold O, Frericks B, John T, Clemens V, Fegert JM, Moers AV.
Dtsch Arztebl Int. 2018 Nov 16;115(46):769-775. doi: 10.3238/arztebl.2018.0769.
PMID:30602409
The effectiveness and risks of long-term opioid therapy for chronic pain: a systematic review for a National Institutes of Health Pathways to Prevention Workshop.
Chou R, Turner JA, Devine EB, Hansen RN, Sullivan SD, Blazina I, Dana T, Bougatsos C, Deyo RA.
Ann Intern Med. 2015 Feb 17;162(4):276-86. doi: 10.7326/M14-2559.