http://www3.nhk.or.jp/news/html/20170902/k10011123241000.html

http://www.asahi.com/articles/ASK913RP7K91UTIL011.html

https://headlines.yahoo.co.jp/hl?a=20170829-00000152-jij-soci

https://headlines.yahoo.co.jp/hl?a=20170902-00000056-mai-soci

http://www.asahi.com/articles/ASK8H5QP1K8HUTIL01Y.html