1. Department of Clinical Experimental Medicine; Unit of Dermatology, University of Messina; Messina Italy
2. Policlinic for Dermatology and Venereology; Saint Kliment Ohridski University, University Hospital Lozenetz; Koziak Street 1 1407 Sofia Bulgaria
3. Unit of Dermatology at A.O.R.N.A.S. “G. Garibaldi” and Department of General Pathology at the University of Catania; Piazza Santa Maria del Gesù 95125 Catania Italy
4. University of Rome “G. Marconi”; Rome Italy
5. Department of Clinical and Molecular Biomedicine; Division of Infectious Diseases at the University of Catania; Catania Italy
6. Department of Microbiology and Immunology; Jefferson Medical College at the Thomas Jefferson University; Philadelphia