1 Pediatric Dermatology Unit, Fondazione IRCCS Ca' Granda, Ospedale Maggiore Policlinico di Milano, Department of Pathophysiology and Transplantation, University of Milan, Milan, Italy.
2 Section of Dermatology, Department of Clinical and Experimental Medicine, Parma University, Parma, Italy.
3 Pediatric Dermatology Unit, Fondazione IRCCS Ca' Granda, Ospedale Maggiore Policlinico di Milano, Department of Pathophysiology and Transplantation, University of Milan, Milan, Italy - gtadinicmce@unimi.it.
4 Department of Pathophysiology and Transplantation, Pediatric Clinic 1, Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico di Milano, University of Milan, Milan, Italy.