[1] Duke Univ, Med Ctr, Cardiol, Durham, NC USA
[2] Duke Clin Rsch Inst, Cardiol, Durham, NC USA
[3] SUNY Stony Brook, Cardiol, Stony Brook, NY 11794 USA
[4] Brigham & Womens Hosp, Div Cardiol, 75 Francis St, Boston, MA 02115 USA
[5] Univ Mississippi, Dept Med, Jackson, MS 39216 USA