1. Nhlangano Health Centre; Box 29 Nhlangano Swaziland
2. Jigme Dorji Wangchuck National Referral Hospital; Thimphu Bhutan
3. Liverpool School of Tropical Medicine; Department of Clinical Sciences; Pembroke Place Liverpool Merseyside UK L3 5QA
4. Stellenbosch University; Centre for Evidence-based Health Care, Division of Epidemiology and Biostatistics, Faculty of Medicine and Health Sciences; PO Box 241 Cape Town South Africa 8000
5. South African Medical Research Council; Cochrane South Africa; PO Box 19070 Tygerberg Cape Town South Africa 7505