http://pc.watch.impress.co.jp/docs/news/20100708_379288.html

http://www.ringolab.com/note/daiya/2010/08/post-1277.html

http://booklog.kinokuniya.co.jp/shikama/archives/2010/08/post_30.html

http://gigazine.net/index.php?/news/comments/20100810_gender_ratio_and_longevity/

http://news.goo.ne.jp/article/sankei/life/snk20100811064.html?fr=rk

http://news.searchina.ne.jp/disp.cgi?y=2010&d=0812&f=national_0812_011.shtml

http://puni.at.webry.info/201008/article_7.html http://blog.livedoor.jp/schulze/archives/51748449.html