Presurgical intravenous parecoxib sodium and follow-up oral valdecoxib for pain management after laparoscopic cholecystectomy surgery reduces opioid requirements and opioid-related adverse effects - Gan, T J; Joshi, G P; Zhao, S Z; Hanna, D B; Cheung, R Y; Chen, C (Acta Anaesthesiol Scand, 2004)