1. Medical Research Council Unit, The Gambia at London School of Hygiene and Tropical Medicine, Fajara Banjul, The Gambia
2. Nigerian Institute of Medical Research, Lagos, Nigeria
3. London School of Hygiene & Tropical Medicine, Department of Disease Control, London, England, UK
4. Centre for International Health, University of Otago, Dunedin, New Zealand
5. Murdoch Children’s Research Institute, Melbourne, Australia
6. Department of Paediatrics, University of Melbourne, Melbourne, Australia