[1] VIRGINIA COMMONWEALTH UNIV,MED COLL VIRGINIA,DEPT CARDIOL,RICHMOND,VA 23298
[2] SALT LAKE CLIN RES FDN,DEPT CARDIOL,SALT LAKE CITY,UT
[3] VANDERBILT UNIV,DEPT CARDIOL,NASHVILLE,TN 37240
[4] BROWN UNIV,AFFILIATED HOSP,DEPT CARDIOL,PROVIDENCE,RI 02912
[5] NHLBI,BETHESDA,MD 20205