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2. https://www.fda.gov/emergency-preparedness-and-response/coronavirus-disease-2019-covid-19/covid-19-vaccines, Accessed September 1, 2022.
3. The history of the United States Advisory Committee on Immunization Practices (ACIP);Walton;Vaccine,2015
4. Centers for Disease Control and Prevention (CDC): Advisory Committee on Immunization Practices (ACIP). Available at: https://www.cdc.gov/vaccines/acip/index.html, Accessed September 1, 2022.
5. Centers for Disease Control and Prevention (CDC). Vaccines for Children Program (VFC). Available at: https://www.cdc.gov/vaccines/programs/vfc/about/distribution.html, Accessed September 1, 2022.