[1] Molinette Mauriziano Hosp, Dept Gastroenterol, I-10126 Turin, Italy
[2] Molinette Mauriziano Hosp, Dept Liver Transplant Surg, I-10126 Turin, Italy
[3] Molinette Mauriziano Hosp, Dept Pathol Div, I-10126 Turin, Italy
[4] Molinette Mauriziano Hosp, Dept Virol Div, I-10126 Turin, Italy