[1] Univ Coll London UCL, Royal Free Hosp, Inst Liver & Digest Hlth, London, England
[2] Azienda Osped Univ Integrata Verona, Liver Unit, Div Gen Med C, Dept Internal Med, Verona, Italy
[3] Univ Cattolica Sacro Cuore, Fdn Policlin Univ Agostino Gemelli IRCCS, Dept Translat Med & Surg, Rome, Italy
[4] Policlin Milan, Dept Pathophysiol & Transplantat & Translat Med, Dept Transfus Med & Hematol, Milan, Italy