1. Heit JA http://www.surgeongeneral.gov/topics/deepvein/workshop/agenda.html 2012
2. American Public Health Association White Paper 2003 http://www.apha.org/NR/rdonlyres/A209F84A-7C0E-4761-9ECF-61D22E1E11F7/0/DVT_ White_Paper.pdf
3. Centers for Medicare and Medicaid Services. Medicare program: hospital inpatient value based purchasing program;Department of Health and Human Services;Fed Regist.,2011
4. The Joint Commission http://www.jointcommission.org/assets/1/6/HAP_NPSG_6-10-11.pdf 2011
5. US Department of Health and Human Services https://www.cms.gov/HospitalAcqCond/downloads/HACFactsheet.pdf 2012