1. Ministry of Health, Labour, and Welfare. Retrieved 27 Jun 2017. http://www.mhlw.go.jp/toukei/list/81-1a.html (In Japanese).
2. Ministry of Health, Labour, and Welfare. Retrieved 27 June 2017. http://www.mhlw.go.jp/toukei/saikin/hw/jinkou/tokusyu/furyo10/01.html (In Japanese).
3. JATEC. Retrieved 27 Jun 2017. http://www.jtcr-jatec.org/index_jatec.html (In Japanese).
4. Japan Trauma Data Bank. Retrieved 27 Jun 2017. http://www.jtcr-jatec.org/traumabank/index.htm (In Japanese).
5. Cabinet Office, Government of Japan. Retrieved 27 Jun 2017. http://www8.cao.go.jp/kourei/whitepaper/w-2015/html/gaiyou/s1_1.html (In Japanese).