[1] Imperial Coll London, Hepatol & Gastroenterol Sect, Div Diabet Endocrinol & Metab, Dept Med, Sr Marys Hosp Campus, London, England
[2] Univ Hosp Policlin Vittorio Emanuele, Infect Dis Dept, Catania, Italy
[3] Univ Catania, Dept Clin & Expt Med, Catania, Italy