1. Department of Internal Medicine, Gastroenterology Unit, San Martino Polyclinic; University of Genova; Genova Italy
2. Department of Medical and Surgical Sciences; Semeiotica Medica Unit, Alma Mater Studiorum-University of Bologna; Bologna Italy
3. Operative Unit of Gastroenterology; Belcolle Hospital; Viterbo Italy
4. Biomedical Department of Internal and Specialistic Medicine; Gastroenterology; Palermo Italy
5. Department of Medical and Surgical Sciences, Internal Medicine Unit; Alma Mater Studiorum-University of Bologna; Bologna Italy
6. Biomedical Department of Internal and Specialistic Medicine, Internal Medicin 2 Unit; Villa Sofia Hospital Agency Riuniti Hospitals-Cervello; Palermo Italy
7. Gastroenterology, Physiopathology and Digestive Endoscopy; Central Hospital of Bolzano; Bolzano Italy
8. Surgery Division; San Marco Polyclinic; Zingonia Italy
9. Department of Internal Medicine; Infermi Hospital of Faenza; Faenza Italy
10. Gastroenterology and Metabolic Diseases Unit; Hospital-University Agency of Pisa; Pisa Italy
11. Department of Gastroenterology, Gastroenterology; Polytechnic-University of Marche; Ancona Italy
12. Department of Surgical and Gastroenterological Sciences, Gastroenterology; University of Padova; Italy
13. Department of Internal Medicine; Cattolica University of Rome; Rome Italy
14. Department of Oncohematology and Internal Medicine; Infection diseases and Hepatology Unit; Parma Italy
15. Internal Medicine and Gastroenterology Unit-Gemelli, Department of Internal Medicine; Rome Italy
16. Medicine Division; Bolognini Hospital Agency; Seriate Italy
17. Gastroenterology Unit, Department of Clinical and Sperimental Medicine; Naples Italy
18. Department of Medical and Surgical Sciences, Zoli Internal Medicine; Alma Mater Studiorum-University of Bologna; Bologna Italy
19. Gastroenterology; Sacro Cuore Don Calabria Hospital; Negrar Italy
20. Department of Internal Medicine and Hepatology; Fatebenefratelli Hospital; Milan Italy
21. Department of Molecular Medicine, University of Padova; Padova Italy
22. Internal Medicine and Hepatology, Department of Sperimental and Clinical Medicine; Florence Italy
23. Department of Medical and Surgical Sciences; Gastroenterology Unit, Alma Mater Studiorum-University of Bologna; Bologna Italy
24. Department of Clinical and Surgical Medicine-Federico II University; Naples Italy