Comparison between Using Bupivacaine 0.5% and Bupivacaine with Sodium Bicarbonate 8.4 % in Thoracic Epidural Anesthesia for Laparoscopic Cholecystectomy. MLU [Internet]. 2021 Jan. 9 [cited 2026 May 25];21(1):1435-41. Available from: https://ijop.net/index.php/mlu/article/view/2525