1. Dermatology Section, Department of Medical, Surgical, and Neurological Sciences, Santa Maria Alle Scotte Hospital, Siena, Italy
2. Pathology Unit, Maggiore Hospital, AUSL Bologna; Department of Medical and Surgical Sciences (DIMEC), University of Bologna, Bologna, Italy
3. Department of Dermatology, Hôpital Erasme, HUB, Université Libre de Bruxelles; Department of Dermatology, Institut Jules Bordet, HUB, Université Libre de Bruxelles, HUB, Brussels, Belgium