1. Gastroenterology and Digestive Endoscopy Unit, Ospedale dei Castelli Hospital, Ariccia, Rome, Italy
2. Department of Anatomical, Histological, Forensic Medicine and Orthopedics Sciences, “Sapienza” University of Rome, Italy
3. UOC Endoscopia Digestiva Chirurgica, Fondazione Policlinico Universitario Agostino Gemelli, IRCCS, Università Cattolica del Sacro Cuore, Roma
4. III Medizinische Klinik, Universitatsklinikum Augsburg, Augsburg, Germany
5. Department of Gastroenterology, Graduate School of Medicine, Chiba University, Chiba, Japan
6. Department of Gastroenterology, Clinic for Internal Medicine, University Hospital Ulm, Germany
7. Humanitas University, Department of Biomedical Sciences, Pieve Emanuele, Italy
8. Humanitas Clinical and Research Center –IRCCS-, Endoscopy Unit, Rozzano, Italy