1. Ichinowatari N. Health Science Research Grants. Study on the early onset dementia. Annual report for the 8th fiscal year of Heisei, 1997 (in Japanese).
2. Asada T. Health and Labor Science Research Grants. Comprehensive Research on Aging and Health. Study on the actual condition of the individuals with early onset dementia and providing the infrastructure for them. Annual report for the 20th fiscal year of Heisei, 2009 (in Japanese).
3. Ikejima C, Ikeda M, Hashimoto M, Ogawa Y, Tanimukai S, Kashibayashi T, Miyanaga K, Yonemura K, Kakuma T, Murotani K, Asada T. Multicenter population-based study on the prevalence of early onset dementia in Japan: vascular dementia as its prominent cause. Psychiatry Clin Neurosci. 2014;68(3):216–24.
4. Mölsä PK, Marttila RJ, Rinne UK. Epidemiology of dementia in a Finnish population. Acta Neurol Scand. 1982;65:541–52.
5. Sulkava R, Wikström J, Aromaa A, et al. Prevalence of severe dementia in Finland. Neurology. 1985;35:1025–9.