Gianluca Lopez1, Nicola Fusco2. 1. Division of Pathology, Fondazione IRCCS Ca' Granda - Ospedale Maggiore Policlinico, University of Milan, Milan, Italy. 2. Division of Pathology, Fondazione IRCCS Ca' Granda - Ospedale Maggiore Policlinico, University of Milan, Milan, Italy. nicola.fusco@unimi.it.