AmlodipineCalcium Channel BlockersAntihypertensive AgentsDihydropyridinesTetrazolesHydrochlorothiazideAzetidinecarboxylic AcidHypertensionGene DosageValineDosage Compensation, GeneticBlood PressureChlorthalidoneDrug Therapy, CombinationNifedipineLisinoprilDouble-Blind MethodDosage FormsAngiotensin II Type 1 Receptor BlockersMibefradilAtenololBenzimidazolesCross-Over StudiesAngiotensin-Converting Enzyme InhibitorsDrug CombinationsDiuretics