1. Department of Global Health and Development London School of Hygiene and Tropical Medicine London UK
2. University of Bordeaux, National Institute for Health and Medical Research (INSERM) UMR 1219, Research Institute for Sustainable Development (IRD) EMR 271, Bordeaux Population Health Centre Bordeaux France
3. Ceped UMR 196, Université Paris Cité, Research Institute for Sustainable Development (IRD), Inserm Paris France
4. Department of Health Services Research and Policy London School of Hygiene and Tropical Medicine London UK
5. Health Section, Program Group, UNICEF New York New York USA
6. IAVI New York New York USA