1. Dermatology Department; Nelson R. Mandela School of Medicine; University of KwaZulu-Natal; 719 Umbilo Road Durban South Africa
2. Division of Dermatology; Department of Medicine; Faculty of Medicine and Health Sciences; University of Stellenbosch; PO Box 19063 Tygerberg 7505 South Africa
3. Department of Dermatology and Cutaneous Surgery; University of Miami Miller School of Medicine; 33136 Miami FL U.S.A