1. World Health Organization. Novel Coronavirus (2019-nCoV): situation report, 1 Geneva: World Health Organization; 2020 [cited 2020 21 January.]. Available from: https://apps.who.int/iris/handle/10665/330760.
2. Johns Hopkins University. Coronavirus resource center 2020 [cited 2020 10 September.]. Available from: https://coronavirus.jhu.edu/.
3. The Asashi Shimbun. National state of emergency expanded to all of Japan 2020 [cited 2020 11 September.]. Available from: http://www.asahi.com/ajw/articles/13303233.
4. Ministry of Health Law. Outbreak of pneumonia associated with a new type of coronavirus 2020 [cited 2020 10 September.]. Available from: https://www.mhlw.go.jp/stf/newpage_08906.html.
5. Asahi Shimbun Digital. A shortage of masks and chaos spread across the China. And Customers hit each other. Masks prices 10 upwards. The man was arrested for selling a poor quality mask 2020 [cited 2020 11 September.]. Available from: https://www.asahi.com/articles/DA3S14349194.html.