[1] PHARM EVALUAT SERV, ENGLEWOOD CLIFFS, NJ USA
[2] UNIV MISSISSIPPI, DEPT INTERNAL MED, DIV ENDOCRINE & HYPERTENS, JACKSON, MS 39216 USA
[3] SO ILLINOIS UNIV, SCH MED, DIV CARDIOL, SPRINGFIELD, IL 62708 USA
[4] UNIV SO ALABAMA, MED CTR, DEPT INTERNAL MED, MOBILE, AL 36688 USA
[5] ALBERT EINSTEIN COLL MED, DEPT CARDIOL, NEW YORK, NY USA
[6] ALLEGHENY GEN HOSP, DIV RENAL, PITTSBURGH, PA 15212 USA
[7] UNIV MARYLAND HOSP, DEPT INTERNAL MED, BALTIMORE, MD 21201 USA
[8] LOUISIANA STATE UNIV, MED CTR, DEPT INTERNAL MED, NEPHROL SECT, NEW ORLEANS, LA 70112 USA
[9] CEDARS SINAI MED CTR, DEPT INTERNAL MED, LOS ANGELES, CA 90048 USA
[10] VET ADM MED CTR, DEPT INTERNAL MED, BALTIMORE, MD 21218 USA
[11] VET ADM MED CTR, DIV PULM, HOUSTON, TX 77211 USA
[12] UNIV TEXAS, HLTH SCI CTR, DEPT INTERNAL MED, DALLAS, TX 75235 USA
[13] VET ADM MED CTR, CTR HYPERTENS, LONG BEACH, CA 90822 USA
[14] UNIV CINCINNATI, MED CTR, HYPERTENS PROGRAM, CINCINNATI, OH 45267 USA