1. Ministry of Health, Labour, and Welfare;Survey of Medical Institutions in 2005
2. Ministry of Internal Affairs and Communications, Statistics Bureau;2005 Population Census of Japan
3. Ministry of Health, Labour, and Welfare;Survey of Physicians, Dentists and Pharmacists in December in 2004
4. 4 Ministry of Health, Labour, and Welfare. About revision of the authorization standard of a brain and heart disease, 12 December 2001. Ministry of Health, Labour and Welfare, Tokyo, 2001. Accessed 6 August 2008. Available from URL: http://www.mhlw.go.jp/houdou/0112/h1212-1.html (in Japanese).
5. 5 Japan Pediatric Society. The design for the pediatric providing system in Japan. Japan Pediatric Society, Tokyo, 2004. Accessed 6 August 2008. Available from URL: http://www.jpeds.or.jp/pdf/kyukyu.pdf (in Japanese).