https://mainichi.jp/articles/20171228/k00/00e/040/288000c

https://twitter.com/makotopic/status/947356472823787520

http://news.tv-asahi.co.jp/news_society/articles/000117627.html

https://www3.nhk.or.jp/news/html/20180102/k10011277121000.html

https://twitter.com/ymhOS/status/945631603933380608