1. 1) World Health Organization: Suicide prevention (official web site of World Health Organization, suicide prevention and special programmes). http://www.who.int/mental_health/prevention/suicide/suicideprevent/en/. Accessed June 3, 2008.
2. 2) National Police Agency Living security locality level section (2007) The profile document of suicide in 2006. The National Police Agency (in Japanese).
3. 3) Ishizaki J (2005) Occupational mental health and practical use of suicide prevention checklist. Job Stress Res 12, 301-8 (in Japanese).
4. 4) Hiro H (2005) Support for return-to-work of suicide attempters and revision of workplace suicide prevention manuals. Job Stress Res 12, 293-300 (in Japanese).
5. 5) Tanaka K (2004) Suicide prevention in the workplace. Job Stress Research 11, 163-6 (in Japanese).