title: Clinical trials in drug treatment: methodology.
mesh_terms: D001676:Biofeedback, Psychology; D002986:Clinical Trials as Topic / Q000379:methods*; D006801:Humans; D011613:Psychotherapy; D012050:Rehabilitation, Vocational; D012064:Relaxation Therapy; D012107:Research Design; D019966:Substance-Related Disorders / Q000188:drug therapy / Q000534:rehabilitation / Q000628:therapy*