1. Department of Global Health and Development, Faculty of Public Health and Policy, London School of Hygiene and Tropical Medicine, London, UK
2. Population Council, Washington, DC, USA
3. Department of Social and Environmental Health Research, Faculty of Public Health and Policy, London School of Hygiene and Tropical Medicine, London, UK
4. Population Council, Nairobi, Kenya
5. Centre for Infectious Disease Control – Zambia (CIDRZ), Zambia
6. Family Planning Association, UK