1 Department of Gastroenterology, Medical School of National and Kapodistrian University of Athens, General Hospital of Athens "Laiko", Athens, Greece.
2 Division of Gastroenterology and Hepatology, Foundation IRCCS Ca' Granda Ospedale Maggiore Policlinico, Milan, Italy.
3 Department of Pathophysiology and Transplantation, CRC "A.M. and A. Migliavacca" Center for Liver Disease, University of Milan, Milan, Italy.