Pethidine efficacy in achieving the ultrasound-guided oblique subcostal transversus abdominis plane block in laparoscopic cholecystectomy: A prospective study. Biomol Biomed [Internet]. 2017 Feb. 21 [cited 2024 May 3];17(1):67-73. Available from: https://bjbms.org/ojs/index.php/bjbms/article/view/1647