1. Dermatology Unit, Fondazione IRCCS Ca’ Granda Ospedale Maggiore Policlinico, 20122 Milan, Italy
2. Department of Clinical Sciences and Community Health, Università Degli Studi di Milano, 20122 Milan, Italy
3. Department of Pathophysiology and Transplantation, Università Degli Studi di Milano, 20122 Milan, Italy
4. Pediatric Unit, Department of Clinical, Surgical, Diagnostic and Pediatric Sciences, University of Pavia, 27100 Pavia, Italy