[1] UNIV MARYLAND HOSP, DEPT MED, DIV NEPHROL, BALTIMORE, MD 21201 USA
[2] UNIV MARYLAND HOSP, DEPT MED, CLIN RES UNIT, BALTIMORE, MD 21201 USA
[3] URBAN CARDIOL RES CTR, BALTIMORE, MD USA
[4] HYPERTENS RES ASSOCIATES, NASHVILLE, TN USA
[5] MT SINAI MED CTR, DEPT MED, CLEVELAND, OH 44106 USA
[6] WAYNE STATE UNIV, CTR HLTH, DEPT MED, DIV ENDOCRINOL & HYPERTENS, DETROIT, MI 48202 USA
[7] HOWARD UNIV, DEPT MED, DIV CARDIOL, WASHINGTON, DC 20059 USA
[8] RUSH PRESBYTERIAN ST LUKES MED CTR, DEPT MED, CHICAGO, IL 60612 USA
[9] VIRGINIA COMMONWEALTH UNIV, MED COLL VIRGINIA, DEPT CLIN PHARMACOL & TOXICOL, RICHMOND, VA 23298 USA
[10] UNIV TEXAS, HLTH SCI CTR, DEPT MED, HOUSTON, TX 77225 USA
[11] MED UNIV S CAROLINA, DEPT CELLULAR & MOLEC PHARMACOL & EXPTL THERAPEUT, CHARLESTON, SC 29425 USA
[12] SIMON WILLIAMSON CLIN, HYPERTENS RES ASSOCIATES, BIRMINGHAM, AL USA
[13] VET ADM MED CTR, DEPT MED, DIV CARDIOL, SAN FRANCISCO, CA USA
[14] LOUISIANA STATE UNIV, MED CTR, DEPT MED, NEW ORLEANS, LA 70112 USA
[15] PHARMACOL EVALUAT SERV INC, ENGLEWOOD, NJ USA