1. Department of Global Health and Population, Harvard T. H. Chan School of Public Health, 677 Huntington Ave, Boston, MA 02115 USA
2. Africa Gender Innovation Lab and Office of the Chief Economist, World Bank and BREAD, 1818 H St. NW, Washington, D.C. 20433, USA
3. Office of the Chief Economist for Human Development, World Bank, 1818 H St. NW, Washington, D.C. 20433, USA