1. Gastroenterology and Endoscopy Unit Fondazione IRCCS Ca’ Granda Ospedale Maggiore Policlinico Milan Italy
2. Clinic of Gastroenterology Department of Medicine Helsinki University Central HospitalUniversity of Helsinki Helsinki Finland
3. Gastroenterology and Hepatology Unit Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico Milan Italy
4. Department of Pathophysiology and Transplantation Università degli Studi Milan Italy
5. General Surgery and Liver Transplantation Unit Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico Milan Italy