1. Department of Clinical and Experimental Medicine; Section of Dermatology; Institute of Dermatology; University of Messina; AOU ‘G. Martino’; Via Consolare Valeria Gazzi 98125 Messina Italy
2. Department of Human Pathology; University of Messina; Messina Italy
3. Department of Dermatology; Freiburg University Medical Center; Freiburg Germany