1. Cabinet Office Government of Japan: white paper on aging society 2012 http://www.8.cao.go.jp/kourei/whitepaper/index-w.html
2. Care-needs certification in the long-term care insurance system of Japan;Tsutui;J Am Geriatr Soc,2005
3. Japan's universal long-term care system reform of 2005: containing costs and realizing a vision;Tsutui;J Am Geriatr Soc,2007
4. Ministry of Health Labour and Welfare Heisei 22 Nendo Kaigo Kyufuhi Jittai Tyousa No Gaikyou 2010 http://www.mhlw.go.jp/toukei/saikin/hw/kaigo/kyufu/10/kekka1.html
5. Relationship between the level of care, degree of bedriddenness, and severity of dementia and mortality rates of elderly requiring long-term care in a hilly and Mountainous area in city A (in Japanese);Kazuko;Kawasaki Med Welf J,2011