1. Department of Clinical and Experimental Medicine, University of Messina, 98100 Messina, Italy
2. Human Pathology of Adult and Child Department, University of Messina, 98100 Messina, Italy
3. Gastroenterology Unit, National Institute of Gastroenterology “S. de Bellis” Research Hospital, Castellana Grotte, 70013 Bari, Italy
4. Gastroenterology and Endoscopy Unit, S. Elia-Raimondi Hospital, 93100 Caltanissetta, Italy
5. Gastroenterology and Endoscopy Unit, Fondazione Instituto San Raffaele Giglio, 90015 Cefalù, Italy
6. Gastroenterology and Emergency Endoscopy Unit, Sandro Pertini Hospital, 00100 Rome, Italy
7. Gastroenterology Unit, Department of Medical Sciences, University of Foggia, 00161 Foggia, Italy
8. Gastroenterology & Hepatology, University of Utah Health, Salt Lake City, UT 84132, USA