1 Rare Diseases Unit, Azienda USL Toscana Centro, European Reference Network-Skin Member, Department of Health Sciences, University of Florence, Florence, Italy.
2 Department of Health Sciences, Section Dermatology, University of Florence, Italy. Electronic address: elisabetta.magnaterra@unifi.it.
3 Department of Health Sciences, Section Dermatology, University of Florence, Italy.
4 Department of Health Sciences, University of Florence, Florence, Italy.