title: Opioid therapy and low back pain.
authors.forename: J
authors.initials: J
authors.lastname: Ryan
mesh_terms: D000701:Analgesics, Opioid / Q000627:therapeutic use*; D002908:Chronic Disease; D006801:Humans; D017116:Low Back Pain / Q000188:drug therapy*
chemical_list: D000701:Analgesics, Opioid