Management of chronic pain.
D001416:Back Pain / Q000628:therapy*; D006801:Humans; D007267:Injections; D009019:Morphinans / Q000627:therapeutic use*; D009266:Nalbuphine / Q000627:therapeutic use*; D019966:Substance-Related Disorders / Q000209:etiology
D009019:Morphinans; D009266:Nalbuphine