1 Dermatology Unit, Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Milan, Italy.
2 Dermatology Unit, Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Milan, Italy; Department of Pathophysiology and Transplantation, Università degli Studi di Milano, Milan, Italy. Electronic address: carlo.maronese@unimi.it.
3 Dermatology & Venereology Department, Dermatology Clinic, Maggiore Hospital, University of Trieste, Trieste, Italy.