Deepak R, Dhanush C M L, Shweta Goyal, Ranjitha Shree CML, and Santosh Nayak K. 2021. “Prediction of the Difficulties of Laparoscopic Cholecystectomy and the Possibility of Conversion to Open Cholecystectomy before Surgery Using Ultrasonographic Criteria”. International Journal of Health and Clinical Research 4 (20):411-16. https://ijhcr.com/index.php/ijhcr/article/view/3310.