1. White Paper on Aging Society of the Cabinet Office http://www8.cao.go.jp/kourei/whitepaper/index-w.html
2. Long-term Care Insurance in Japan, General Affairs Division Health and Welfare Bureau for the Elderly Ministry of Health, Labor and Welfare http://www.mhlw.go.jp/english/topics/elderly/care/index.html
3. The 2010 Report of the Ministry of Health, Labor and Welfare, Japan http://www.mhlw.go.jp/english/
4. Prevention of aspiration pneumonia (AP) with oral care;Tada;Arch Gerontol Geriatr,2012
5. Influence of periodontal disease on systemic disease: inversion of a paradigm: a review;Bansal;J Med Life,2013