1. World Health Organization, Department of Maternal, Newborn, Child and Adolescent Health and Ageing, Geneva, Switzerland
2. London School of Hygiene and Tropical Medicine, Faculty of Epidemiology and Population Health, London, United Kingdom
3. UNDP/UNFPA/UNICEF/WHO/The World Bank Special Programme of Research, Development and Research Training in Human Reproduction (HRP), World Health Organization, Department of Sexual and Reproductive Health, Geneva, Switzerland
4. London School of Hygiene and Tropical Medicine, NIHR Health Protection Research Unit in Environmental Change and Health, London, United Kingdom