[1] Univ Athens, Attikon Univ Gen Hosp, Hepatogastroenterol Unit, Dept Internal Med 2,Res Inst,Med Sch, Athens, Greece
[2] Univ Athens, Attikon Univ Gen Hosp, Med Sch, Diabet Ctr, Athens, Greece
[3] Alexandra Hosp, Gastroenterol Dept, Athens, Greece
[4] Osped Nuova Regina Margherita, Digest Endoscopy Unit, Rome, Italy