1. ASST Rhodense, Gastroenterology and Endoscopy Unit, Garbagnate Milanese, Milan, Italy
2. ASST Rhodense, Gastroenterology and Endoscopy Unit, Rho, Milan, Italy
3. Bolognini Hospital, Gastroenterology Unit, Seriate, Italy
4. Gastroenterology Unit, Nuovo Regina Margherita Hospital, Rome, Italy
5. Humanitas University, Department of Biomedical Sciences, Rozzano, Milan, Italy