1. Center for Suicide Prevention; National Center of Neurology and Psychiatry
2. Department of Neuropsychiatry; Graduate School of Medicine; The University of Tokyo
3. Department of Psychiatry; Tokyo Metropolitan Tama Medical Center; Tokyo
4. Department of Psychiatry; Faculty of Medicine, Fukuoka University; Fukuoka
5. Health Management and Promotion Center; Yokohama City University Graduate School of Medicine; Yokohama; Japan
6. Department of Psychiatry and Behavioral Sciences; Tokyo Metropolitan Institute of Medical Science