[1] Univ Milan, Maggiore Hosp,FIRC Unit Liver Canc, IRCCS,AM&A Migliavacca Ctr Liver Dis, Div Hepatol,Dept Gastroenterol & Endocrinol, I-20122 Milan, Italy
[2] Univ Milan, I-20122 Milan, Italy
[3] Univ Milan, San Paolo Hosp, Dept Med Surg & Dent, Chair Med Stat, Milan, Italy