[1] Medical School of Universidade Federal do Rio Grande do Sul – (FAMED-UFRGS),Postgraduate Program in Medicine: Surgical Sciences
[2] Medical School of Universidade Federal do Rio Grande do Sul – (FAMED-UFRGS),Postgraduate Program in Genetics and Molecular Biology
[3] Universidade Federal do Rio Grande do Sul (UFRGS),Service of Digestive Surgery, Hospital de Clínicas de Porto Alegre (HCPA)
[4] Universidade Federal do Rio Grande do Sul (UFRGS),Service of Pathology, Hospital de Clínicas de Porto Alegre (HCPA)
[5] Universidade Federal do Rio Grande do Sul (UFRGS),Service of Digestive Surgery, Group for Biliary Tract and Pancreas, Hospital de Clínicas de Porto Alegre (HCPA)