Need for additional control in studies of epidural outcome.
Johnson
Michael E
ME
D015360:Analgesia, Epidural; D003106:Colon / Q000601:surgery; D013505:Digestive System Surgical Procedures; D006801:Humans; D010149:Postoperative Pain / Q000188:drug therapy*; D011788:Quality of Life; D012107:Research Design; D016896:Treatment Outcome