1. 1) Alzheimer’s Disease International: Chapter 2. The global prevalence of dementia. In: World Alzheimer’s Report 2015. The Global Impact of Dementia, 2015, pp10–28. https://www.alz.co.uk/research/worldalzheimerreport2015summary.pdf (Accessed Jul. 3, 2017)
2. 2) Ministry of Health, Labour and Welfare: Basic survey of people’s lives; 2016. http://www.mhlw.go.jp/toukei/saikin/hw/k-tyosa/k-tyosa16/dl/05.pdf (Accessed Jul. 3, 2017)
3. 3) OECD: Health at a glance 2015 OECD Indicators. Paris: OECD Publishing, 2015, pp198–199. http://dx.doi.org/ (Accessed Jul. 3, 2017)
4. 4) Yoshimura N, Muraki S, Oka H, et al.: Prevalence of knee osteoarthritis, lumbar spondylosis, and osteoporosis in Japanese men and women: the research on osteoarthritis/osteoporosis against disability study. J Bone Miner Metab, 2009, 27: 620–628.
5. 5) Japanese Orthopaedic Association: Locomotive syndrome pamphlet 2015. Tokyo: The Locomotive Challenge! Council, 2015. https://locomo-joa.jp/en/index.pdf (Accessed Jul. 3, 2017)