title: Relief of postoperative pain by morphine in the epidural space - a controlled clinical study.
mesh_terms: D000328:Adult; D002986:Clinical Trials as Topic; D004311:Double-Blind Method; D004824:Epidural Space; D006801:Humans; D007267:Injections; D008297:Male; D009020:Morphine / Q000008:administration & dosage / Q000009:adverse effects / Q000627:therapeutic use*; D010149:Postoperative Pain / Q000175:diagnosis / Q000188:drug therapy*
chemical_list: D009020:Morphine