http://news.goo.ne.jp/article/internet_watch/trend/internet_watch-708732.html

http://www.mhlw.go.jp/stf/houdou/0000089845.html

https://kanpou.npb.go.jp/20150629/20150629g00145/20150629g001450005f.html

https://kanpou.npb.go.jp/20150629/20150629g00145/20150629g001450005f.html

http://www3.nhk.or.jp/news/html/20150625/k10010127831000.html