1. Gastroenterology Unit, Division of Gastroenterology, Hepatology, and Nutrition, Department of Life, Health and Environmental Sciences, University of L’Aquila, Piazzale Salvatore Tommasi 1, 67100 L’Aquila, Italy
2. Division of Gastroenterology, Galliera Hospital, 16128 Genoa, Italy
3. Diagnostic and Surgical Endoscopy Unit, San Salvatore Academic Hospital, 67100 L’Aquila, Italy