Sidra Riaz, Naveed Ali Khan, Abdul Khalique, Raazia Ramzan, Munira Abdul Aziz. “Validation of a Pre-Existing Scoring System for Preoperative Prediction of Difficulty in Laparoscopic Cholecystectomy”. Pakistan Journal of Medical & Health Sciences, vol. 17, no. 04, June 2023, p. 405, doi:10.53350/pjmhs2023174405.