1. Vital Signs: Pregnancy-Related Deaths, United States, 2011–2015, and Strategies for Prevention, 13 States, 2013–2017
2. World Health Organization . Trends in maternal mortality 2000 to 2017: estimates by who, UNICEF, UNFPA, world bank group and the United nations population division. Geneva; 2019.
3. Centers for Disease Control and Prevention . Pregnancy mortality surveillance system. Available: https://www.cdc.gov/reproductivehealth/maternal-mortality/pregnancy-mortality-surveillance-system.htm [Accessed 20 July 2020].
4. Pregnancy-Related Mortality in the United States, 2011–2013
5. Davis NL , Smoots AN , Goodman DA . Pregnancy-Related deaths: data from 14 U.S. maternal mortality review committees, 2008-2017. Atlanta, GA: Centers for Disease Control and Prevention, U.S. Department of Health and Human Services, 2019.