1. Statistics and Information Policy Department, Ministry of Health, Labour and Welfare. Handbook of health and welfare statistics; 2018, pp. 1–30.
2. Fujino Y, et al. A nationwide cohort study of educational background and major causes of death among the elderly population in Japan (the JACC study group). Prev Med. 2005;40:444–51.
3. Watanabe N, et al. Regional differences of suicide. Mental Sci. 2004;118:34–9.
4. Health and Welfare for Persons with Disabilities Department, Ministry of Health, Labour and Welfare. White Paper on comprehensive measures to prevent suicide; 2019, pp. 1–5, 14.
5. Motohashi Y, et al. Suicide can be prevented. Supika; 2005.