1 Department of Clinical Experimental Medicine, Unit of Dermatology, at the University of Messina (Italy) C/O A.O.U. "G. Martino", Via Consolare Valeria, 1, 98125 Messina, Italy.
2 Department of Veterinarian Sciences at the Università of Messina (Italy), Viale Annunziata, 98168 Messina, Italy.
3 Policlinic for Dermatology and Venereology, Saint Kliment Ohridski University, Medical Faculty, University Hospital Lozenetz, Koziak Street 1, 1407 Sofia, Bulgaria.
4 Dermatology Operative Unit at AORNAS "G. Garibaldi", Piazza Santa Maria del Gesù, 95100 Catania, Italy.