title: What works for difficult-to-treat back pain.
mesh_terms: D004599:Electric Stimulation Therapy / Q000379:methods; D015444:Exercise; D006801:Humans; D017116:Low Back Pain / Q000534:rehabilitation / Q000628:therapy*; D009294:Narcotics / Q000627:therapeutic use; D012075:Remission, Spontaneous; D013123:Spinal Fusion
chemical_list: D009294:Narcotics