1. Section of Dermatology, Department of Health Sciences University of Florence Florence Italy
2. Department of Dermatology, Policlinico Umberto I Sapienza University of Rome Rome Italy
3. Dermatology Department University of Modena and Reggio Emilia Modena Italy
4. Dermatology University of California San Francisco San Francisco California USA
5. IRCCS Azienda Ospedaliero‐Universitaria di Bologna Bologna Italy
6. Dermatology, Department of Experimental, Diagnostic and Specialty Medicine (DIMES) University of Bologna Bologna Italy