1 Department of Medical, Surgical and Neurological Science, Dermatology Section, University of Siena, S. Maria alle Scotte Hospital, Viale Bracci 16, 53100, Siena, Italy.
2 Department of Dermatology, Skin Center Senigallia, 60019, Senigallia, Italy.
3 Department of Anatomic Pathology, Macerata Hospital, 62100, Macerata, Italy.
4 Department of Dermatology, University Hospital of Saint-Etienne, 42055, Saint-Etienne, France.