1. Department of Medicine; Section of Dermatology and Venereology; University of Verona; Piazzale A. Stefani 1 I-37126 Verona Italy
2. GISED Study Centre; Ospedali Riuniti; Bergamo Italy
3. Department of Dermatology; University of Rome ‘Tor Vergata’; Rome Italy
4. Italian Psoriatic Patient Association (ADIPSO); Rome Italy
5. Laboratory of Cutaneous Physiopathology; San Gallicano Dermatological Institute; Rome Italy