1 Department of Reproductive Health and Research including UNDP/UNFPA/UNICEF/WHO/World Bank Special Programme of Research, Development and Research Training in Human Reproduction (HRP), World Health Organization, Geneva, Switzerland.
2 Department of Maternal, Newborn, Child and Adolescent Health, World Health Organization, Geneva, Switzerland.
3 Family, Women and Children's Health Cluster, World Health Organization, Geneva, Switzerland.