CENTER FOR DISEASE CONTROL WEBSITE (DVT TOPICS) 

http://www.cdc.gov/ncbddd/dvt/default.htm

"For over 60 years, the CDC has been dedicated to protecting health and promoting quality of life through the prevention and control of disease, injury, and disability.  We are committed to programs that reduce the health and economic consequences of the leading causes of death and disability, thereby ensuring a long, productive, healthy life for all people."