https://news.goo.ne.jp/article/yomiuri/politics/20210215-567-OYT1T50101.html
https://www3.nhk.or.jp/news/html/20210215/k10012868741000.html
https://www3.nhk.or.jp/news/html/20210215/k10012868111000.html
https://www.nikkansports.com/m/sports/news/202102140000559_m.html?mode=all
https://www.bloomberg.co.jp/news/articles/2021-02-14/QOJBW5T1UM1201