[1] Univ Verona, Dept Med, I-37100 Verona, Italy
[2] Univ Geneva, Dept Clin Pathol, Geneva, Switzerland
[3] Polytecn Univ Marche, Dept Gastroenterol, Ancona, Italy
[4] Ist Ric S De Bellis, Castellano Grotte, Italy
[5] Univ Padua, Dept Diagnost Sci & Special Therapies, Padua, Italy
[6] Univ Hosp Geneva, Div Gastroenterol & Hepatol, Geneva, Switzerland