1. Richard M. Friedenberg: the role of the Super technologist. Radiology. 2000;215:630–3.
2. The Japanese Ministry of Health, Labor and Welfare: The team approach to healthcare. http://www.mhlw.go.jp/shingi/2010/03/dl/s0319-9a.pdf .
3. The Japanese Ministry of Education, Science, Sports and Culture: the Japanese government policies in education, science, sports and culture 1996. http://www.mext.go.jp/b_menu/hakusho/html/hpad199601/hpad199601_2_126.html .
4. The Japanese Health and Welfare Statistics Association: Annual Statistical Report of National Health Conditions 1985, Tokyo. 1985.
5. The Japanese Ministry of Health, Labor and Welfare: Survey of Medical Institutions & Hospital Report 2009. http://www.mhlw.go.jp/toukei/saikin/hw/iryosd/09/index.html .