1 Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Division of Gastroenterology and Hepatology, Milan, Italy.
2 Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Department of Pathology, Milan, Italy.
3 Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Division of Gastroenterology and Hepatology, Milan, Italy. Electronic address: francesca.donato@policlinico.mi.it.