1. Department of Dermatology; University of Modena and Reggio Emilia; Modena Italy
2. Department of Biostatistics and Telemedicine; Jagiellonian University Medical College; Krakow Poland
3. Skin Cancer Unit Arcispedale S. Maria Nuova; IRCCS; Reggio Emilia Italy
4. Division of Dermatology; Department of Medicine; University of California, San Diego; La Jolla CA USA