1. Dermatology and Skin Cancer Unit, Arcispedale Santa Maria Nuova-IRCCS, Reggio Emilia, Italy
2. Dermatology Unit, University of Modena and Reggio Emilia, Modena, Italy
3. Nonmelanoma Skin Cancer Unit, Department of Dermatology and Venereology, Medical University of Graz, Graz, Austria
4. Dermatology Unit, Second University of Naples, Naples, Italy