1. Gopinath G. The great lockdown: Worst economic downturn since the great depression. 2020. [cited 2021 Jan 14]. Available from: https://blogs.imf.org/2020/04/14/the-great-lockdown-worst-economic-downturn-since-the-great-depression/.
2. Centers for Disease Control and Prevention (CDC). United States COVID-19 cases, deaths, and laboratory testing (NAATs) by state, territory, and jurisdiction. 2021. [cited 2021 Dec 20]. Available from: https://covid.cdc.gov/covid-data-tracker/#cases_casesper100klast7days.
3. The COVID-19 Pandemic and the $16 Trillion Virus
4. US Food and Drug Administration. FDA approves first COVID-19 vaccine. 2021. [cited 2021 Aug 31]. Available from: https://www.fda.gov/news-events/press-announcements/fda-approves-first-covid-19-vaccine.
5. US Food and Drug Administration. Moderna COVID-19 Vaccine. 2021. [cited 2021 Jan 19]. Available from: https://www.fda.gov/emergency-preparedness-and-response/coronavirus-disease-2019-covid-19/moderna-covid-19-vaccine.