1. 1. Ono Y: Screening for depressive state and using the outcome to build a suicide prevention system. In: Scientific Research Report for Grant-in-Aid from the Ministry of Health and Welfare, Tokyo, School of Medicine, Keio University, 1999 (in Japanese)
2. Epidemiology of suicidal ideation and help-seeking behaviors among the elderly in Japan
3. Risk factors for suicide in later life