title: Efficacy of tramadol in treatment of chronic low back pain.
authors: E
authors: E
authors: Whitney
mesh_terms: D000701:Analgesics, Opioid / Q000627:therapeutic use*; D002908:Chronic Disease; D006801:Humans; D017116:Low Back Pain / Q000188:drug therapy*; D016032:Randomized Controlled Trials as Topic; D014147:Tramadol / Q000627:therapeutic use*; D016896:Treatment Outcome
chemical_list: D000701:Analgesics, Opioid; D014147:Tramadol