http://www.americanheart.org/presenter.jhtml?identifier=2114

http://www.medicinenet.com/high_blood_pressure/article.htm

http://www.nhlbi.nih.gov/health/dci/Diseases/Hbp/HBP_WhatIs.html

http://www.americanheart.org/presenter.jhtml?identifier=2112

http://en.wikipedia.org/wiki/Hypertension

http://www.cdc.gov/bloodpressure/about.htm

http://www.emedicinehealth.com/high_blood_pressure/article_em.htm

http://familydoctor.org/online/famdocen/home/common/heartdisease/risk/092.html

http://www.nhlbi.nih.gov/hbp/

http://www.webmd.com/hypertension-high-blood-pressure/