Ondansetron is no more effective than supplemental intraoperative oxygen for prevention of postoperative nausea and vomiting. - Goll,V.; Akca,O.; Greif,R.; Freitag,H.; Arkilic,C.F.; Scheck,T.; Zoeggeler,A.; Kurz,A.; Krieger,G.; Lenhardt,R.; Sessler,D.I. (Anesth Analg, 2001)