Kumar, Arun, Kunwar Vishal Singh, Jugendra Pal Singh Shakya, Sangita Sahu, Soniya Dhiman, and Neelabh Agrawal. 2017. “Prediction of Difficulties During Laparoscopic Cholecystectomy by Preoperative Clinical Examination and Ultrasonography”. International Surgery Journal 4 (4):1335-40. https://doi.org/10.18203/2349-2902.isj20171137.