1. Department of Gastroenterology, IRCCS Humanitas Research Hospital, Rozzano, Milan, Italy;
2. Medicina Interna e Gastroenterologia, CEMAD Centro Malattie Dell'Apparato Digerente, Università Cattolica Del Sacro Cuore, Fondazione Policlinico Universitario A. Gemelli IRCCS. Rome, Italy;
3. Department of Gastroenterology and Digestive Endoscopy, Azienda Ospedaliera San Giovanni Addolorata, Rome, Italy;
4. Unit of Gastroenterology and Digestive Endoscopy, S. Eugenio Hospital, Rome, Italy;
5. Dipartimento di Medicina Traslazionale e di Precisione, Sapienza University of Rome, Rome, Italy;
6. Gastroenterology and Gastrointestinal Endoscopy Unit, Vita-Salute San Raffaele University, IRCCS San Raffaele Scientific Institute, Milan, Italy;
7. Dipartimento Scienze Medico-Chirurgiche e Medicina Traslazionale, Universita' Sapienza Roma, Ospedale Universitario Sant'Andrea, Rome, Italy;
8. Department of Digestive Diseases, Campus Bio Medico University, Rome, Italy;
9. Department of Biomedical Sciences, Humanitas University, Pieve Emanuele, Milan, Italy;
10. Gastroenterology & Hepatology Section, Department of Medicine & Surgery, University of Perugia, Perugia, Italy;
11. PO di Malattie Dell'Apparato Digerente, Università di Salerno, AOU San Giovanni di Dio e Ruggi D'Aragona, Salerno, Italy;
12. First Department of Medicine, University of Pavia, Pavia, Italy;
13. Department of Medicine and Ageing Sciences and Center for Advanced Studies and Technology (CAST), “G. D'Annunzio” University of Chieti-Pescara, Chieti-Pescara, Italy;
14. Dip. Di Scienze e Biotecnologia Medico Chirurgiche, Sapienza University of Rome, Rome, Italy;
15. Department of Public Health and Infectious Diseases, Sapienza University of Rome, Rome, Italy.