1. Clinical Research Department, Faculty of Infectious and Tropical Diseases, London School of Hygiene & Tropical Medicine, Keppel Street, London, WC1E 7HT, UK
2. Infectious Diseases Department, Hospital Prof. Doutor Fernando Fonseca, IC 19, 2720-276 Amadora, Portugal
3. Region Sanitaria Bolama-Bijagós, Bubaque, Guinea-Bissau
4. Bandim Health Project, Apartado 861 Bissau, Guinea-Bissau
5. Ministry of Public Health, Avenida Unidade Africana, 26, Bissau, Guinea-Bissau
6. MRC Unit The Gambia at London School of Hygiene & Tropical Medicine, Atlantic Boulevard, Fajara P.O. Box 273, Banjul, The Gambia
7. Disease Control Department, Faculty of Infectious and Tropical Diseases, London School of Hygiene & Tropical Medicine, Keppel Street, London, UK
8. Hospital for Tropical Diseases, University College London Hospitals NHS Trust, London, UK