Intervention~Control group (dual therapy) study drug (placebo): normal saline 150ml Dexamethasone 5 mg palonosetron 0.075 mg,~Experimental group (triple therapy) Study Drug (Fosaprepitant): resolved in normal saline 150mL Dexamethasone, Palonosetron 0.075mg,
As a preventive for postoperative nausea and vomiting in patients undergoing laparoscopic gynecological surgery, the investigators shall investigate the efficacy of the triple therapy of dexamethasone, palonosetron, and fosaprepitant comparing to dual therapy of dexamethasone and palonosetron.