1. Skin Cancer Unit; Arcispedale Santa Maria Nuova IRCCS; Reggio Emila Italy
2. Department of Dermatology; University of Modena and Reggio Emilia; Modena Italy
3. Department of Otolaryngology Head & Neck Surgery; Medical School; Aristotle University; Thessaloniki Greece
4. Department of Dermatology; Hospital de Clınicas de Porto Alegre; Universidade Federal do Rio Grande do Sul; Porto Alegre Brazil
5. Instituto de Investigaciones Medicas; Universidad de Buenos Aires; Buenos Aires Argentina
6. Department of Dermatology; Medical Faculty; Ege University; Izmir Turkey
7. Hospital 9 de Julho; São Paulo Brasil
8. Department of Dermatology; Medical University of Graz; Graz Austria