Refractory hypertension: determination of prevalence, risk factors, and comorbidities in a large, population-based cohort.
Calhoun DA, Booth JN, Oparil S, Irvin MR, Shimbo D, Lackland DT, Howard G, Safford MM, Muntner P. Refractory hypertension: determination of prevalence, risk factors, and comorbidities in a large, population-based cohort. Hypertension. 2014 Mar; 63(3):451-8.