1. Centers for Disease Control and Prevention. Severe maternal morbidity in the United States [Internet]. [updated 2017 Nov 27
2. cited 2018 Oct 2]. Available from: https://www.cdc.gov/reproductivehealth/maternalinfanthealth/severematernalmorbidity.html
3. Centers for Disease Control and Prevention. Severe maternal morbidity indicators and corresponding ICD codes during delivery hospitalizations [Internet]. [updated 2018 Aug 21
4. cited 2018 Oct 2]. Available from: https://www.cdc.gov/reproductivehealth/maternalinfanthealth/smm/severe-morbidity-ICD.htm
5. Centers for Disease Control and Prevention. Maternal mortality [Internet]. [cited 2020 Jul 8]. Available from: https://www.cdc.gov/nchs/maternal-mortality/index.htm