Participants ( age @ years ) with hypertension but with blood pressure less than @/@ mm Hg were randomly assigned ( @:@:@:@:@:@:@:@ ) by a @-h interactive web response system in blocks of @ to @ weeks of double-blind treatment with nebivolol and valsartan fixed-dose combination ( @ and @ mg/day , @ and @ mg/day , or @ and @ mg/day ) , nebivolol ( @ mg/day or @ mg/day ) , valsartan ( @ mg/day or @ mg/day ) , or placebo .