1. (2023, January 23). WHO Coronavirus (COVID-19) Dashboard. Available online: https://covid19.who.int/.
2. (2023, January 23). Ministry of Health, Labour and Welfare, Health Crisis Management in the Community—Guidelines for Community Health Crisis Management, Available online: https://www.mhlw.go.jp/general/seido/kousei/kenkou/guideline/index.html.
3. (2023, January 23). National Association of Public Health Center Directors, Changes in the Number of Public Health Centers. Available online: http://www.phcd.jp/03/HCsuii/index.html.
4. (2023, January 23). National Institutite of Population and Social Security Research, Social Security Annual Report (1993). Available online: https://www.ipss.go.jp/s-toukei/j/t_nenpo_back/libr_new.html.
5. (2023, January 23). Ministry of Health, Labor and Welfare, Annual Health, Labour and Welfare Report 2020. Available online: https://www.mhlw.go.jp/stf/wp/hakusyo/kousei/19/.