UMBARKAR, P. R. . Predictive Ultrasonographic Factors for Difficult Laparoscopic Cholecystectomy: A Cross-Sectional Study. Journal of Biomedical and Pharmaceutical Research, [S. l.], v. 7, n. 1, 2018. Disponível em: http://www.jbpr.in/index.php/jbpr/article/view/1183. Acesso em: 19 apr. 2026.