1. Liverpool School of Tropical Medicine; Department of Clinical Sciences; Pembroke Place Liverpool Merseyside UK L3 5QA
2. University of Birmingham; Cancer Research UK Clinical Trials Unit, School of Cancer Sciences; Birmingham West Midlands UK B15 2TT
3. World Health Organization; UNICEF/UNDP/World Bank/WHO Special Programme for Research and Training in Tropical Diseases (TDR); 1211 Geneva 27 Geneva Switzerland
4. University of Birmingham; Public Health, Epidemiology and Biostatistics; Edgbaston Birmingham UK B15 2TT