Muneeb, M. D., and M. A. Naushad Baig. “Postoperative Pain After Gallbladder Retrieval from Umbilical and Epigastric Ports in Laparoscopic Cholecystectomy: A Randomized Controlled Trial”. Journal of the Dow University of Health Sciences (JDUHS), vol. 13, no. 3, Dec. 2019, pp. 138-42, doi:10.36570/jduhs.2019.3.694.