[1] BETH ISRAEL HOSP, DEPT MED, DIV CARDIOL, BOSTON, MA 02215 USA
[2] BETH ISRAEL HOSP, CHARLES A DANA RES INST, BOSTON, MA 02215 USA
[3] HARVARD UNIV, BETH ISRAEL HOSP, THORNDIKE LAB, BOSTON, MA 02215 USA
[4] HARVARD UNIV, SCH MED, BOSTON, MA 02115 USA