1. Division of Human Nutrition; Wageningen University; Wageningen The Netherlands
2. Nutrition and Health Department; School of Public Health and Community Development; Maseno University; Maseno Kenya
3. MRC Unit The Gambia; Banjul The Gambia
4. MRC International Nutrition Group; London School of Hygiene and Tropical Medicine; London UK
5. Cell Biology and Immunology Group; Wageningen University; Wageningen The Netherlands