AmlodipineCalcium Channel BlockersAntihypertensive AgentsDihydropyridinesTetrazolesHydrochlorothiazideAzetidinecarboxylic AcidHypertensionValineBlood PressureChlorthalidonePhysiciansMedical Staff, HospitalNifedipineLisinoprilDrug Therapy, CombinationAngiotensin II Type 1 Receptor BlockersMibefradilPhysician-Patient RelationsDouble-Blind MethodAtenololBenzimidazolesAngiotensin-Converting Enzyme InhibitorsCross-Over StudiesAttitude of Health PersonnelFamily Practice