1. Digestive Surgery Division, Liver Surgery Unit; Department of Gastroenterology; University of Sao Paulo Medical School; São Paulo Brazil
2. Department of Pathology; University of Sao Paulo Medical School; São Paulo Brazil
3. Service de Chirurgie Digestive; Viscérale et Endocrinienne, Groupe Hospitalier Diaconesses; Croix Saint Simon; São Paulo Brazil
4. The Ohio State University; Wexner Medical Center; Columbus, Ohio