1. School of Medicine Vita‐Salute San Raffaele University Milan Italy
2. Dermatology Clinic IRCCS San Raffaele Scientific Institute Milan Italy
3. Dermatology Unit, Surgical, Medical and Dental Department of Morphological Sciences Related to Transplant, Oncology and Regenerative Medicine University of Modena and Reggio Emilia Modena Italy
4. Department of Dermatology University Hospital of Saint Etienne Saint‐Etienne France
5. Dermatology Section, Department of Medical, Surgical and Neurological Science, S. Maria alle Scotte Hospital University of Siena Siena Italy
6. Dermatology Clinic, Department of Clinical Internal, Anesthesiological and Cardiovascular Sciences Sapienza University of Rome Rome Italy