Anti-emetic efficacy of prophylactic granisetron, droperidol and metoclopramide in the prevention of nausea and vomiting after laparoscopic cholecystectomy: a randomized, double-blind, placebo-controlled trial. - Fujii,Y.; Saitoh,Y.; Tanaka,H.; Toyooka,H. (Eur. J. Anaesthesiol., 1998)