1. World Health Organization . Trends in maternal mortality: 1990 to 2015. estimates by who, UNICEF, UNFPA, the world bank and the United nations population division. Geneva: World Health Organization, 2015. (Accessed 25 July 2017).
2. United Nations Children’s Fund . Levels and trends in child mortality: report 2015. The un Inter-agency group for child mortality estimates. Available: https://www.unicef.org/publications/files/Child_Mortality_Report_2015_Web_9_Sept_15.pdf [Accessed 25 July 2017].
3. United Nations Inter-agency Group for Child Mortality Estimation (UN-IGME) . Levels and trends in child mortality, 2015. Available: http://www.who.int/maternal_child_adolescent/documents/levels_trends_child_mortality_2015/en/ [Accessed 18 Aug 2017].
4. Global causes of maternal death: a who systematic analysis;Say;The Lancet Global Health,2014
5. World Health Organization . World health statistics 2017: monitoring health for the SDGs, sustainable development goals. Available: http://apps.who.int/iris/bitstream/10665/255336/1/9789241565486-eng.pdf [Accessed 5 Feb 2018].