Postoperative analgesic regime will be standardized in all patients with 12-hourly intramuscular diclofenac 75 mg started immediately at the end of surgery and morphine via patient-controlled analgesia (PCA): 1 mg bolus with an 8 minutes lockout. Postoperative nausea or vomiting will be treated with intravenous metoclopramide 10 mg as required.