Busee JW, Schandelmaier S, Kamaleldin M, Hsu S, Riva JJ, Vandvik PO, Tsoi L, Lam T, Ebrahim S, Johnston B, Oliveri L, Montoya L, Kunz R, Malandrino A, Bhatnagar N, Mulla SM, Lopes LC, Soobiah C, Wong A, Buckley N, Sessler D, Guyatt GH: Opioids for chronic non-cancer pain: a protocol for a systematic review of randomized controlled trials. Syst Rev 2013; 2: 66
October 12, 2013