1. Provisional mortality data—United States, 2020;Ahmad;MMWR Morb Mortal Wkly Rep,2021
2. Estimation of excess deaths associated with the COVID-19 pandemic in the United States, March to May 2020.;Weinberger;JAMA Intern Med,2020
3. National Center for Health Statistics. Vital statistics reporting guidance: guidance for certifying deaths due to COVID-19. Hyattsville, MD: US Department of Health and Human Services, CDC, National Center for Health Statistics; 2020. Accessed January 6, 2021. https://www.cdc.gov/nchs/data/nvss/vsrg/vsrg03-508.pdf
4. National Center for Health Statistics. Section I: instructions for classifying the underlying cause-of-death, 2017. Hyattsville, MD: US Department of Health and Human Services, CDC, National Center for Health Statistics; 2017. https://www.cdc.gov/nchs/data/dvs/2a_2017.pdf
5. CDC. COVID-19: people with certain medical conditions. Atlanta, GA: US Department of Health and Human Services, CDC; 2021. Accessed March 15, 2021. https://www.cdc.gov/coronavirus/2019-ncov/need-extra-precautions/people-with-medical-conditions.html