1. Gastroenterology and Endoscopy Unit, S. Elia-Raimondi Hospital, Caltanissetta, Italy
2. IRCCS Azienda Ospedaliero Universitaria di Bologna, Bologna, Italy
3. Department of Medical and Surgical Sciences, University of Bologna, Bologna, Italy
4. Department of Medical and Surgical Sciences, University of Foggia, Foggia, Italy
5. Gastroenterology Unit, National Institute of Gastroenterology-IRCCS “Saverio de Bellis”, Castellana Grotte, Bari, Italy
6. Gastroenterology and Endoscopy Unit, Fondazione Istituto San Raffaele Giglio, Cefalu, Italy
7. Digestive Diseases Endoscopy Unit, Policlinico G. Martino Hospital, University of Messina, Messina, Italy
8. Gastroenterology & Hepatology, University of Utah Health, Salt Lake City, UT, USA
9. Royal Free Unit for Endoscopy, The Royal Free Hospital and University College London Institute for Liver and Digestive Health, Hampstead, London, UK
10. Department of Gastroenterology, Cleveland Clinic London, London, UK