Nkomo, Vuyisile, Julius Gardin, Thomas Skelton, John Gottdiener, Christopher Scott, Maurice Enriquez-Sarano. Burden of Valvular Heart Diseases: a population-based study. Lancet. September 2006; 368(9540). http://www.ncbi.nlm.nih.gov/pubmed/16980116
The number of ambulatory medical care visits for hypertension was 55 million in 2009–49,966,000 physician office visits, 1,000,000 emergency department visits, and 4,182,000 outpatient visits.
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