title: Chronic back pain and substance abuse.
authors.forename: J
authors.initials: J
authors.lastname: Ryan
mesh_terms: D001416:Back Pain / Q000150:complications* / Q000188:drug therapy; D002908:Chronic Disease; D006801:Humans; D009294:Narcotics / Q000627:therapeutic use; D019966:Substance-Related Disorders / Q000150:complications*
chemical_list: D009294:Narcotics