Trials of postoperative antiemetics need three arms.
Goodman
N W
NW
D000932:Antiemetics / Q000627:therapeutic use*; D002986:Clinical Trials as Topic / Q000379:methods; D004329:Droperidol / Q000627:therapeutic use; D006801:Humans; D011182:Postoperative Care
D000932:Antiemetics; D004329:Droperidol