[1] Texas Heart Inst, Houston, TX 77025 USA
[2] Clin Univ St Luc, B-1200 Brussels, Belgium
[3] Flinders Med Ctr, Bedford Pk, SA, Australia
[4] Newark Beth Israel Med Ctr, Newark, NJ 07112 USA
[5] St Michaels Hosp, Toronto, ON M5B 1W8, Canada
[6] Brigham & Womens Hosp, Boston, MA 02115 USA
[7] Duke Clin Res Inst, Durham, NC USA