Effect of Ondansetron on Postoperative Pain and Vomiting after Acute Appendicitis Surgery: A Placebo-Controlled Double-Blinded Randomized Clinical Trial oleh Moein Khoori, Peyman Mirghaderi, Alireza Azarboo, Forough Jamil, Nasim Eshraghi, Alireza Abdollahzadeh Baghaei