Note 13
From the USA Medical System Is The Leading Cause Of Death

HCUPnet, Healthcare Cost and Utilization Project for the Agency for Healthcare Research and Quality.

http://www.ahrq.gov/data/hcup/hcupnet.htm ,
http://hcup.ahrq.gov/HCUPnet.asp,
http://hcup.ahrq.gov/HCUPnet.asp