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Prevalence of secondary causes of hypertension associated with resistant hypertension in a cohort of 125 patients from Brazil. Reproduced with permission: Pedrosa RP, Drager LF, Gonzaga CC, Sousa MG, de Paula LK, Amaro AC, Amodeo C, Bortolotto LA, Krieger EM, Bradley TD, Lorenzi-Filho G. Obstructive sleep apnea: The most common secondary cause of hypertension associated with resistant hypertension. Hypertension. 2011;58:811–817.
