1. Vaccines and Immunity Theme, Medical Research Council Unit The Gambia at the London School of Hygiene & Tropical Medicine, Banjul, The Gambia
2. The Aurum Institute, Global Health Division, Johannesburg, South Africa
3. Division of Infectious Diseases and Tropical Medicine, Medical Centre of the University of Munich (LMU) and German Center for Infection Research (DZIF), Partner Site Munich, Munich, Germany
4. Health Economics and Epidemiology Research Office, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, South Africa