1. Department of Dermatology; Nelson R. Mandela School of Medicine; University of KwaZulu-Natal; Durban South Africa
2. Section of Clinical, Allergological and Venereological Dermatology; Department of Clinical Medicine and Surgery; University of Naples Federico II; Naples Italy
3. Department of Economical and Statistical Sciences; University of Naples Federico II; Naples Italy
4. Department of Dermatology and Cutaneous Surgery; University of Miami Miller School of Medicine; Miami FL USA
5. School of Clinical Medicine; Nelson R. Mandela School of Medicine; University of KwaZulu-Natal; Durban South Africa