1. 1) Ministry of Health, Labour and Welfare: 〈http://www.mhlw.go.jp/seisakunitsuite/bunya/hukushi_kaigo/kaigo_koureisha/chiiki-houkatsu/dl/link1-1.pdf〉, cited 10 October, 2014.
2. 2) Onda M., Geriatr. Gerontol. Int., 4, 132-140 (2004).
3. 3) Nanaumi Y., Onda M., Sakurai H., Tanaka R., Tsubota K., Matoba S., Mukai Y., Arakawa Y., Hayase Y., Yakugaku Zasshi, 131, 843-851 (2011).
4. 4) Ministry of Health, Labour and Welfare: 〈http://www.mhlw.go.jp/stf/shingi/2r9852000002djkw-att/2r9852000002djvq.pdf〉, cited 10 October, 2014.
5. 5) Katsuno J., Yukawa H., Ideguchi N., Jpn. J. Cancer Chemother., 36, 101-103 (2009).