1. Gastroenterology, Hepatology & Digestive Endoscopy Section, Department of Medicine and Surgery, University of Perugia, Perugia, Italy
2. Gastroenterology & Hepatology Unit, Perugia General Hospital, Perugia, Italy
3. Gastronterology Unit, “ARNAS G. Brotzu”, Cagliari, Italy
4. Gastrointestina Unit, Department of Translational Research and New Technologies in Medicine and Surgery, University of Pisa, Pisa, Italy
5. Gastroenterology Unit, University of Cagliari, Monserrato, Italy
6. Pathology Institute, ASST-Spedali Civili Brescia, Brescia, Italy