Maternal, Adolescent, Reproductive, and Child Health Centre, London School of Hygiene and Tropical Medicine, London, United Kingdom (E.O.O., E.B., Y.B.O., J.E.L., H.B.); Department of Medical Statistics, London School of Hygiene and Tropical Medicine, London, United Kingdom (J.E.L.); Human Reproduction Program (the UNDP/UNFPA/WHO/World Bank Special Programme of Research, Development and Research Training in Human Reproduction), Department of Sexual and Reproductive Health and Research, World Health Organization, Geneva, Switzerland (A.-B.M., A.L., J.A.C.); Department of Data and Analytics, World Health Organization, Geneva, Switzerland (W.R.M.); Division of Data, Analytics, and Delivery for Impact, World Health Organization, Geneva, Switzerland (D.E.F.); Division of Data, Analytics, Planning, and Monitoring, United Nations Children’s Fund, New York, NY (S.C., J.K., J.R.); Global Health, School of Public Health and Community Medicine, Institute of Medicine, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden (L.H.-A.); and Department of Women and Children’s Health, Uppsala University, Uppsala, Sweden (E.W.J.)