1. Dermatologic Unit; Department of Head and Neck Surgery; Azienda Ospedaliero Universitaria Policlinico di Modena; Modena Italy
2. Section of Dermatology; Catholic University of the Sacred Heart; Rome Italy
3. Section of Dermatology; Department of Medicine; University of Verona; Verona Italy
4. Section of Dermatology; Department of Medicine; University of Padua; Padua Italy