1. Global, regional, and national levels and trends in maternal mortality between 1990 and 2015, with scenario-based projections to 2030: a systematic analysis by the UN Maternal Mortality Estimation Inter-Agency Group;Alkema;Lancet North Am Ed,2016
2. Diversity and divergence: the dynamic burden of poor maternal health;Graham;Lancet North Am Ed,2016
3. United Nations. Sustainable Development Goal 3. 2018. https://sustainabledevelopment.un.org/sdg3 (accessed 4 April 2019).
4. The WHO application of ICD-10 to deaths during pregnancy, childbirth and the puerperium: ICD-MM,2012
5. Pregnancy and susceptibility to infectious diseases;Sappenfield;Infect Dis Obstet Gynecol,2013