1. Arias E. United States Life Tables, 2004. National Vital Statistics Reports 2007;56.
2. Dennison C, Pokras R. Design and operation of the National Hospital Discharge Survey: 1988 redesign. Vital Health Stat. 2000;1:1–42.
3. Wennberg J, Gittelsohn A. Small area variations in health care delivery. Science. 1973;182:1102–8.
4. Lloyd-Jones D, Adams RJ, Brown TM, et al. Heart disease and stroke statistics – 2010 update. A report from The American Heart Association. Circulation. 2009;17:17.
5. Bach DS, Radeva JI, Birnbaum HG, Fournier AA, Tuttle EG. Prevalence, referral patterns, testing, and surgery in aortic valve disease: leaving women and elderly patients behind? J Heart Valve Dis. 2007;16:362–9.