1. MRC Unit The Gambia at LSHTM, Atlantic Road, Fajara, The Gambia.
2. MRC Human Immunology Unit, MRC Weatherall Institute of Molecular Medicine, University of Oxford, John Radcliffe Hospital, Oxford, UK.
3. Walter and Eliza Hall Institute for Medical Research, 1G Royal Parade, Melbourne, Parkville, Victoria 3052, Australia.
4. Department of Genetics, University of Cambridge, Cambridge, UK.
5. GroundWork, 7306 Fläsch, Switzerland.
6. Human Nutrition Laboratory, Institute of Food, Nutrition and Health, Department of Health Sciences and Technology, ETH Zurich, Zurich, Switzerland.