[1] NEW ENGLAND DEACONESS HOSP, DEPT MED, BOSTON, MA 02215 USA
[2] DUKE UNIV, MED CTR, DURHAM, NC 27710 USA
[3] VANDERBILT UNIV, MED CTR, NASHVILLE, TN 37240 USA
[4] BARNES HOSP, ST LOUIS, MO 63110 USA
[5] INST CARDIOL MONTREAL, MONTREAL H1T 1C8, QUEBEC, CANADA
[6] MED CTR HOSP, SAN ANTONIO, TX USA
[7] MT SINAI HOSP, TORONTO M5G 1X5, ONTARIO, CANADA
[8] VIRGINIA COMMONWEALTH UNIV, MED COLL VIRGINIA, RICHMOND, VA 23298 USA
[9] UNIV MASSACHUSETTS, MED CTR, WORCESTER, MA 01605 USA
[10] MASSACHUSETTS GEN HOSP, BOSTON, MA 02114 USA
[11] ST VINCENTS HOSP & MED CTR, PORTLAND, OR USA