[1] Univ Milan, Osped Maggiore Policlin, Div Gastroenterol & Hepatol, Milan, Italy
[2] Univ Hosp Pisa, Liver Unit, Reference Ctr Chron Liver Dis & HCC Tuscany Reg, Pisa, Italy
[3] Univ Palermo, DiBiMIS, Gastroenterol & Hepatol, Palermo, Italy
[4] Univ Naples 2, Sect Infect Dis & Viral Hepatitis, Dept Internal Med, Naples, Italy
[5] Univ Turin, Dept Gastroenterol, Turin, Italy
[6] Roche, Monza, Italy