[1] Univ Padua, Dept Med Diagnost Sci & Special Therapies, Pathol Unit, I-35100 Padua, Italy
[2] Rovereto & Trento Hosp, Dept Gastroenterol, Trento, Italy
[3] Vicenza Hosp, Dept Gastroenterol, Vicenza, Italy
[4] Univ Padua, Dept Gen Surg & Organ Transplantat, Surg Unit, Clin Chirurg 3, I-35100 Padua, Italy