1. South African Medical Research Council; South African Cochrane Centre; P. O. Box 19070 Tygerberg Cape Town Western Cape South Africa 7505
2. KEMRI-Wellcome Trust Research Programme; Health Services Research Group; Kenyatta National Hospital Grounds, P.O. Box 43640 - 00100 Nairobi Kenya
3. Liverpool School of Tropical Medicine; Department of Clinical Sciences; Pembroke Place Liverpool Merseyside UK L3 5QA
4. World Health Organization; UNICEF/UNDP/World Bank/WHO Special Programme for Research and Training in Tropical Diseases (TDR); 1211 Geneva 27 Geneva Switzerland