1. South African Medical Research Council; South African Cochrane Centre; PO Box 19070 Tygerberg Western Cape South Africa 7505
2. Médecins Sans Frontières; Rue de Lausanne PO BOx 116 Geneva Switzerland
3. Stellenbosch University; Centre for Evidence-based Health Care, Faculty of Medicine and Health Sciences; Francie v Zyl Tygerberg Cape Town South Africa
4. Liverpool School of Tropical Medicine; Department of Clinical Sciences; Pembroke Place Liverpool Merseyside UK L3 5QA