1. London School of Hygiene and Tropical Medicine; MRC International Nutrition Group; London UK
2. Nutrition Theme; MRC Unit The Gambia; Banjul Gambia
3. Cell Biology and Immunology Group, & Research; Wageningen The Netherlands
4. Division of Human Nutrition; Wageningen University and Research; Wageningen The Netherlands
5. Laboratory for Microbiology and Immunology; Admiral de Ruyter Hospital; Goes The Netherlands
6. Laboratory for Microbiology and Infection Control; Amphia Hospital; Breda The Netherlands