[1] Univ Milano Bicocca, Dept Surg & Translat Med, Milan, Italy
[2] Univ Milano Bicocca, Dept Hlth Sci, Ctr Biostat Clin Epidemiol, Milan, Italy
[3] Univ Milano Bicocca, Res Ctr Publ Hlth CESP, Milan, Italy
[4] Osped Niguarda Ca Granda, Dept Gastroenterol & Hepatol, Liver Unit, Milan, Italy
[5] Yale Univ, Sch Med, Ctr Liver, New Haven, CT 06510 USA
[6] Yale Univ, Sch Med, Dept Internal Med, Sect Digest Dis, New Haven, CT 06510 USA