A Multicenter, Randomized, Double-blind, Placebo-controlled, Parallel Group, Phase II Study to Evaluate the Safety and Efficacy of Oral Dosing with GW679769 (50 mg or 150 mg) for Three Consecutive Days When Administered with a Single Intravenous Dose of Ondansetron Hydrochloride for the Prevention of Post-operative Nausea and Vomiting and Post-discharge Nausea and Vomiting in Female Subjects with Known Risk Factors for Post-operative Nausea and Vomiting Who are Undergoing Laparoscopic/Laparotomic Surgical Procedures Associated with an Increased Emetogenic Risk