[1] Pisa Univ Hosp, Div Gen & Transplant Surg, I-56124 Pisa, Italy
[2] IRCCS Ist, Clin Humanitas, Pancreat Surg Sect, Dept Surg, Milan, Italy
[3] Univ Roma La Sapienza, Digest & Liver Dis Unit, Rome, Italy
[4] Univ Verona, Dept Pathol, I-37100 Verona, Italy
[5] European Inst Oncol, Milan, Italy
[6] Univ Pisa, Dept Biol, I-56100 Pisa, Italy
[7] Univ Vita Salute San Raffaele, Div Gastroenterol & Gastrointestinal Endoscopy, Milan, Italy
[8] Univ Bologna, Dept Radiol, I-40126 Bologna, Italy
[9] Univ Verona, Surg & Gastroenterol Dept, I-37100 Verona, Italy