Estefan, Alberto, Silvio Melogno, and Roberto Portos. “Gallbladder Cancer: Incidence and Pathology: About 175 Observations”. Cirugía del Uruguay 43, no. 5 (February 21, 1973): 347–353. Accessed June 15, 2026. https://replica-revista.scu.org.uy/index.php/cir_urug/article/view/2467.