1. World Health Organization. Trends in Maternal Mortality: 1990–2015: Estimates from WHO, UNICEF, UNFPA, World Bank Group and the United Nations Population Division. World Health Organization; 2015.
2. World Health Organization. Tracking Universal Health Coverage: 2021 Global Monitoring Report. World Health Organization; 2021.
3. World Health Organization. International Bank for Reconstruction and Development. Tracking Universal Health Coverage: 2017 Global Monitoring Report. World Bank Group. World Health Organization and International Bank for Reconstruction and Development The World Bank; 2017.
4. World Health Organization. Trends in Maternal Mortality 2000 to 2017: Estimates by WHO, UNICEF, UNFPA, World Bank Group and the United Nations Population Division. World Health Organization; 2019.