1. KwaZulu-Natal Department of Health; Epidemiology; Langalibalele Street Pietermarizburg South Africa 3201
2. Stellenbosch University; Centre for Evidence-based Health Care; Francie van Zijl Drive Tygerberg Cape Town South Africa 7505
3. South African Medical Research Council; South African Cochrane Centre; Cape Town South Africa
4. Nelson R Mandela School of Medicine, University of KwaZulu-Natal; Department of Public Health Medicine; P Bag 7 Congella South Africa 4013
5. Liverpool School of Tropical Medicine; Department of Clinical Sciences; Pembroke Place Liverpool UK L3 5QA
6. Stellenbosch University; Centre for Evidence-based Health Care, Faculty of Medicine and Health Sciences; PO Box 241 Cape Town South Africa 8000