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