1. Division of Dermatology Department of Medicine Tygerberg Academic Hospital and Stellenbosch University Cape Town South Africa
2. Centre for Evidence Based Health Care (CEBHC) Division of Epidemiology and Biostatistics Department of Global Health Faculty of Medicine and Health Sciences Stellenbosch University Cape Town South Africa
3. Division of Epidemiology and Biostatistics Department of Global Health Faculty of Medicine and Health Sciences Stellenbosch University Cape Town South Africa