1. Department of Infectious Diseases Epidemiology, London School of Hygiene and Tropical Medicine, London, United Kingdom;
2. College of Medicine, University of Lagos, Lagos, Nigeria;
3. Disease Control and Elimination Theme, Medical Research Council Unit The Gambia, Fajara, The Gambia;
4. Department of Medical Laboratory Science, University of Jos, Plateau, Nigeria;
5. Department of Preventive and Social Medicine, Centre for International Health and the Otago International Health Research Network, University of Otago School of Medicine, Dunedin, New Zealand
6. Bioprocess Research and Development, Sanofi Pasteur, Toronto, Ontario, Canada;
7. World Health Organization-Regional Office for Africa, Brazzaville, Congo;