3Pierre S, Benais H,Pouymayou J. Apfel's simplified score mayfavourably predict the risk of postoperative nausea and vomiting. Can J Anesth ,2002,49:237-242.
4Stadler M, Bardiau F, Seidel L, et al. Difference in risk factofor postoperative nausea and vomiting. Anesthesiology, 2000,98 : 46-52.