Phase II Multicentre, Randomised, Double-Blind, Placebo and Active-Controlled, Dose-Ranging, Parallel Group Study of the Safety and Efficacy of The Oral Neurokinin-1 Receptor Antagonist, GW679769 in Combination with Ondansetron Hydrochloride and Dexamethasone for the Prevention of Chemotherapy-Induced Nausea and Vomiting in Cancer Subjects Receiving Highly Emetogenic Cisplatin-based Chemotherapy.