1. Gastroenterology and Digestive Endoscopy, Vita-Salute San Raffaele University, Milan, Italy
2. Gastroenterology and Digestive Endoscopy, San Camillo-Forlanini Hospital, Rome, Italy
3. Mount Sinai, New York, NY, USA
4. University of Ioannina, Ioannina, Greece
5. Teknon Medical Center, Barcelona, Spain
6. DGD Kliniken Frankfurt Sachsenhausen, Frankfurt/Main, Germany
7. Azienda ULSS 8 Berica, Vicenza, Italy
8. ASL Bari, Bari, Italy
9. Asl Latina, Latina, Italy
10. Azienda Ospedaliero-Universitaria Mater Domini, Catanzaro, Italy
11. ASL Roma 6, Albano Laziale, Italy
12. CliCon S.r.l. Società Benefit Health, Economics & Outcomes Research, Bologna, Italy
13. CSL Vifor, Glattbrugg, Zürich, Switzerland
14. Department of Gastroenterology, University Hospital Heraklion, P.O. BOX 1352, Heraklion, Crete 71110, Greece