1. Department of Digestive and Liver Disease; Sant'Andrea Hospital; Sapienza University Rome; Rome Italy
2. Department of Pathology; Sant'Andrea Hospital; Sapienza University Rome; Rome Italy
3. Department of Digestive Endoscopy; Sant'Andrea Hospital; Sapienza University Rome; Rome Italy
4. Centro Ricerche S. Pietro; Ospedale S. Pietro; Rome Italy
5. Department of Haematology; Sant'Andrea Hospital; Sapienza University Roma; Rome Italy