Nadeem, F., M. Khan, and F. U. Naz. “Comparison of Mean Pain Scores for the Patients With sub hepatic Drainage to Those Without It After Elective Uncomplicated Laparoscopic Cholecystectomy: Post Operative Pain After Laparoscopic Cholecystectomy”. Pakistan Journal of Medical Sciences, Vol. 35, no. 1, Jan. 2019, doi:10.12669/pjms.35.1.224.