1. Gastroenterology and Endoscopy Unit, Fondazione “Casa Sollievo della Sofferenza”, IRCCS, San Giovanni Rotondo, Foggia, Italy
2. Department of Gastroenterology, National Institute of Gastroenterology – IRCCS “Saverio de Bellis” – Castellana Grotte, Bari, Italy
3. Endoscopy Unit, Humanitas Clinical and Research Center – IRCCS – Rozzano, Rozzano, Italy
4. Department of Biomedical Sciences, Humanitas University – Rozzano, Foggia, Italy
5. Department of Gastroenterology, Postgraduate Institute of Medical Education and Research, Chandigarh, India
6. Department of Medical Sciences, Section of Gastroenterology, Foggia, Italy