1. US CDC. Scientific Brief: SARS-CoV-2 Transmission. https://www.cdc.gov/coronavirus/2019-ncov/science/science-briefs/sars-cov-2-transmission.html. Accessed July 31, 2023.
2. U.S. Census Bureau. Quarterly Retail E-Commerce Sales. https://www.census.gov/retail/ecommerce.html. Accessed March 17, 2023.
3. Korea Agro-Fisheries & Food Trade Corporation. Food Information Statistics System. https://www.at.or.kr/home/apen000000/index.action. Accessed December 11, 2023.
4. Statistics Korea. COVID-19 Dashboard. https://kosis.kr/covid_eng/covid_index.do. Accessed December 20, 2023.
5. Korea Transport Institute. A Study on the Response Strategy for Post COVID-19 by Transportation Sector. Korea Transport Institute, Sejong, Republic of Korea, 2021.