1. 1) Ministry of Health, Labour and Welfare. Vital Statistics 2012: 〈http://www.mhlw.go.jp/toukei/saikin/hw/jinkou/kakutei12/index.html〉, cited 14 April, 2015.
2. 2) Ministry of Health, Labour and Welfare: 〈http://www.mhlw.go.jp/seisaku/24.html〉, cited 14 April, 2015.
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5. 5) Ishimoto K., Otsubo Y., Tamura C., Uchida Y., Ishimitsu T., Kamiya A., Yakugaku Zasshi, 124, 149-157 (2004).