http://itpro.nikkeibp.co.jp/atcl/column/14/346926/022300845/?itp_pickup

http://www.tokyo-np.co.jp/article/living/life/201703/CK2017030502000150.html

http://headlines.yahoo.co.jp/hl?a=20170312-00000000-jct-soci&p=1

https://news.biglobe.ne.jp/domestic/0309/jj_170309_4349260970.html

https://www.bengo4.com/c_1009/n_5829/