Yaqub, U.; Zohra, S.; Hussain, S. M.; Ehsan, A.; Imran, A.; Ilyas, S. CONVERSION OF LAPAROSCOPIC CHOLECYSTECTOMY TO OPEN CHOLECYSTECTOMY: PREOPERATIVE RISK FACTORS AND INTRAOPERATIVE REASONS. Pak Armed Forces Med J 2020, 70 (5), 1288-93.