title: Ethical considerations in clinical trials.
mesh_terms: D000328:Adult; D000368:Aged; D002986:Clinical Trials as Topic / Q000592:standards*; D004992:Ethics, Medical; D005260:Female; D006801:Humans; D008875:Middle Aged; D009019:Morphinans / Q000627:therapeutic use*; D009266:Nalbuphine / Q000627:therapeutic use*; D010149:Postoperative Pain / Q000188:drug therapy*
chemical_list: D009019:Morphinans; D009266:Nalbuphine