1. San-in Chuo Shimbun Febuary 20 (2021), pp. 2.
2. Yomiuri Shimbun Febuary 20 (2021), pp. 4.
3. Ministry of Health, Labour and welfare [cited 2021 February 24]; Available from: https://www.mhlw.go.jp/file/06-Seisakujouhou-12000000-Shakaiengokyoku-Shakai/0000034191.pdf.