1. Stellenbosch University; Community Health Division, Faculty of Medicine and Health Sciences; Francie van Zijl Drive Tygerberg Cape Town South Africa 7505
2. Stellenbosch University; Centre for Evidence-based Health Care, Faculty of Medicine and Health Sciences; Francie van Zijl Drive Tygerberg Cape Town South Africa 7505
3. South African Medical Research Council; South African Cochrane Centre; PO Box 19070 Tygerberg Western Cape South Africa 7505
4. Birmingham Heartlands Hospital; Department of Infection; Bordesley Green East Birmingham UK B9 5SS
5. Massachusetts General Hospital; Department of Dermatology; Boston Massachusetts USA 02115
6. Harvard Medical School; Department of Dermatology; Boston Massachusetts USA 02115