• https://mainichi.jp/english/articles/20200214/p2g/00m/0na…
• https://mainichi.jp/english/articles/20200214/p2g/00m/0na/044000c
• https://www.medrxiv.org/content/10.1101/2020.02.07.20021154v1
• https://mainichi.jp/english/articles/20200214/p2g/00m/0na/044000c
• https://www.medrxiv.org/content/10.1101/2020.02.07.20021154v1