1. Maternal, Adolescent, Reproductive & Child Health (MARCH) Centre, London School of Hygiene and Tropical Medicine, London, United Kingdom
2. Department of Infectious Disease Epidemiology, Faculty of Epidemiology and Population Health, London School of Hygiene and Tropical Medicine, London, United Kingdom
3. Department of Veterinary Medicine, University of Cambridge, Cambridge, United Kingdom
4. Department of Immunization, Vaccines and Biologicals, World Health Organization, Geneva, Switzerlandand
5. Bill & Melinda Gates Foundation, Seattle, Washington, USA