title: Pain relief: the state of the art.
mesh_terms: D001676:Biofeedback, Psychology; D003216:Conditioning, Operant; D004599:Electric Stimulation Therapy; D006801:Humans; D008349:Manipulation, Orthopedic; D010146:Pain / Q000188:drug therapy / Q000503:physiopathology; D010148:Intractable Pain / Q000503:physiopathology; D010166:Palliative Care / Q000639:trends; D012064:Relaxation Therapy; D009435:Synaptic Transmission