1. Dermatology DivisionDepartment of Medical, Surgical and NeuroSciencesUniversity of Siena Siena Italy
2. Department of Medical BiotechnologiesUniversity of Siena Siena Italy
3. Anatomopathology UnitDepartment of PathologyUniversity Hospital of St‐Etienne Saint Etienne France
4. Dermatology UnitUniversity Hospital of St‐Etienne Saint Etienne France