Still CH, Craven TE, Freedman BI, Van Buren PN, Sink KM, Killeen AA, Bates JT, Bee A, Contreras G, Oparil S, Pedley CM, Wall BM, White S, Woods DM, Rodriguez CJ, Wright JT. Baseline characteristics of African Americans in the Systolic Blood Pressure Intervention Trial. J Am Soc Hypertens. 2015 Sep; 9(9):670-9.