1. Department of Dermatology, University of Rome ‘Tor Vergata’, Rome, Italy;
2. Department of Dermatology, University of Florence, Firenze, Italy;
3. Department of Medical Sciences and Public Health, Section of Dermatology, University of Cagliari, Cagliari, Italy;
4. Department of Medicine, Section of Clinical, Allergological and Venereological Dermatology, University of Perugia, Perugia, Italy;
5. Department of Medicine, Medicine, Endocrine and Metabolic Sciences Section, University of Perugia, Perugia, Italy