1. Unit of Dermatology, Department of Medical-Surgical Science and Biotechnologies, Sapienza University of Rome, A. Fiorini Hospital, 04019 Terracina, Italy
2. School of Medicine, Vita-Salute San Raffaele University, 20132 Milan, Italy
3. Dermatology Clinic, IRCCS San Raffaele Hospital, 20132 Milan, Italy
4. Dermatology Unit, “Sapienza” University of Rome, Viale del Policlinico 155, 00161 Rome, Italy
5. Section of BioMedical Statistics, Department of Public Health and Infectious Disease, Sapienza University, 00185 Rome, Italy