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2. Hamel L, Kirzinger A, Munana C, Brodie M. Kaiser Family Foundation. COVID-19 vaccine monitor: December 2020. https://www.kff.org/coronavirus-covid-19/report/kff-covid-19-vaccine-monitor-december-2020/. Published December 15, 2020. Accessed December 19, 2020.
3. Centers for Disease Control and Prevention. COVID-19 vaccine effectiveness and safety. https://www.cdc.gov/mmwr/covid19_vaccine_safety.html Updated September 28, 2021. Accessed September 30, 2021.
4. Centers for Disease Control and Prevention. Demographic trends of COVID-19 cases and deaths in the US reported to CDC. https://covid.cdc.gov/covid-data-tracker/#demographics. Updated October 14, 2021. Accessed December 11, 2021.
5. Hamel L, Lopes L, Sparks G, Stokes M, Brodie M. KFF COVID-19 vaccine monitor - April 2021. Kaiser Family Foundation. https://www.kff.org/coronavirus-covid-19/poll-finding/kff-covid-19-vaccine-monitor-april-2021/. Published May 6, 2021. Accessed May 8, 2021.