title: Epidural morphine in the treatment of chronic pain.
mesh_terms: D002908:Chronic Disease; D004824:Epidural Space; D006801:Humans; D007267:Injections; D009020:Morphine / Q000008:administration & dosage / Q000627:therapeutic use*; D010146:Pain / Q000188:drug therapy*
chemical_list: D009020:Morphine