1. Gastroenterology and Endoscopy Unit; Fondazione IRCCS Ca´ Granda - Ospedale Maggiore Policlinico; Milan Italy
2. Department of Radiology; Clinical Hospital Centre Rijeka; Rijeka Croatia
3. Department of Transfusion Medicine and Haematology; Fondazione IRCCS Ca' Granda - Ospedale Maggiore Policlinico; Milano Italy
4. Department of Gastroenterology; Heart of England NHS Foundation Trust; Birmingham UK
5. Department of Gastroenterology; Clinical Hospital Centre Rijeka; Rijeka Croatia
6. Department of Clinical Sciences and Community Health - Laboratory of Medical Statistics, Biometry and Epidemiology "G.A. Maccacaro"; Università degli Studi di Milano; Milan Italy