1. Reiwa 2nd Year Edition Annual Report on Health, Labour and Welfare,2019
2. Report of the Study Group of Experts on Healthy Life Expectancy,2019
3. Role of the social support network which influences age of death and physical function of elderly people: study of trends in and outside of Japan and future problems. [Nihon Koshu Eisei Zasshi];Kishi;Jpn. J. Publ. Health,2004
4. Effects of social relationships on mortality of the elderly: how do the influences change with the passage of time?;Sato;Arch. Gerontol. Geriatr.,2008
5. Social relationships and mortality risk: a meta-analytic review;Holt-Lunstad;PLoS Med.,2010