1. Department of Paediatrics, Oxford University Hospitals, University of Oxford, Oxford, United Kingdom;
2. Oxford University Clinical Academic Graduate School, Oxford, United Kingdom;
3. Kenya Medical Research Institute/Wellcome Trust Research Programme, Centre of Geographic Medicine Research-Coast, Kilifi District Hospital, Kilifi, Kenya;
4. Medical Research Council Human Immunology Unit, Weatherall Institute of Molecular Medicine, University of Oxford, Oxford University Hospitals, United Kingdom;
5. Department of Medicine, Imperial College, London, United Kingdom;
6. Medical Research Council International Nutrition Group, London School of Hygiene and Tropical Medicine, London, United Kingdom; and
7. Medical Research Council Keneba, Keneba, The Gambia