1. Gunja MZ, Gumas ED, Williams RD, II. The U.S. maternal mortality crisis continues to worsen: an international comparison, To the Point (blog), commonwealth fund, 2022. https://doi.org/10.26099/8vem-fc65
2. Maternal mortality rates in the United States, 2021;Hoyert;NCHS Health E-Stats,2023
3. Vital signs: pregnancy-related deaths, United States, 2011–2015, and strategies for prevention, 13 states, 2013–2017;Petersen;MMWR Morb Mortal Wkly Rep,2019
4. Centers for Disease Control and Prevention. Severe maternal morbidity in the United States. 2022. Available at:https://www.cdc.gov/reproductivehealth/maternalinfanthealth/severematernalmorbidity.html#:∼:text=Severe%20Maternal%20Morbidity%2C%201993%E2%80%932014&text=The%20overall%20rate%20of%20SMM,1993%20to% 20122.3%20in%202014. Accessed October 25, 2023.
5. Racial and ethnic disparities in the incidence of severe maternal morbidity in the United States, 2012-2015;Admon;Obstet Gynecol,2018