https://mainichi.jp/articles/20181217/k00/00m/040/184000c

https://www3.nhk.or.jp/shutoken-news/20181221/0022955.html

https://headlines.yahoo.co.jp/hl?a=20181221-00000572-san-soci

https://headlines.yahoo.co.jp/hl?a=20181221-00009026-bengocom-soci

https://www.westlawjapan.com/column-law/2018/181221/