Response to a second single antihypertensive agent used as monotherapy for hypertension after failure of the initial drug. Department of Veterans Affairs Cooperative Study Group on Antihypertensive Agents - Materson, BJ; Reda, DJ; Preston, RA; Cushman, WC; Massie, BM; Freis, ED; Kochar, MS; Hamburger, RJ; Fye, C; Lakshman, R (Arch Intern Med, 1995)
et al.