1. Gastroenterology and Digestive Endoscopy Unit, ASST Rhodense, 20094 Garbagnate Milanese, Italy
2. Gastroenterology and Digestive Endoscopy Unit, Azienda USL Modena, 41012 Carpi, Italy
3. Gastroenterology Unit, Surgical and Medical Sciences Department, Sant’Orsola Malpighi Hospital, 40138 Bologna, Italy
4. Gastroenterology Unit, Major Policlinic Hospital, 20122 Milan, Italy