1. Medical Research Council Unit The Gambia at London School of Hygiene and Tropical Medicine, Fajara
2. Faculty of Infectious and Tropical Diseases, London School of Hygiene and Tropical Medicine, United Kingdom
3. Medical Research Council Tropical Epidemiology Group, London School of Hygiene and Tropical Medicine, United Kingdom
4. Microbiological Diagnostic Unit Public Health Laboratory, Department of Microbiology and Immunology, University of Melbourne, Doherty Institute for Infection and Immunity, Victoria, Australia
5. Institute of Tropical Medicine, Antwerp, Belgium
6. Faculty of Epidemiology and Population Health, London School of Hygiene and Tropical Medicine, United Kingdom