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2. Two Years of U.S. COVID-19 Vaccines Have Prevented Millions of Hospitalizations and Deaths;Fitzpatrick;The Commonwealth Fund blog,2022
3. HHS Secretary Xavier Becerra Statement on End of the COVID-19 Public Health Emergency. US Department of Health and Human Services; May 11, 2023. Accessed July 6, 2023. https://www.hhs.gov/about/news/2023/05/11/hhs-secretary-xavier-becerra-statement-on-end-of-the-covid-19-public-health-emergency.html.
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5. Mortality in the United States, 2020;Murphy,2021