Farhanchi A, Rahmani M, Moharamzadeh L, Kalani P. The Comparisons of Intra-Peritoneal Bupivacaine Instillation versus Trendelenburg Position and Valsalva Maneuver on the Laparoscopic Cholecystectomy-induced Abdominal and Shoulder Pain. Arch Anesth & Crit Care. 2015;1(3):67-71.