[1] Northwestern Univ, Feinberg Sch Med, Div Cardiol, Chicago, IL 60611 USA
[2] Brown Univ, Providence, RI 02912 USA
[3] SUNY Buffalo, Buffalo, NY 14260 USA
[4] Case Western Reserve Univ, Cleveland, OH 44106 USA
[5] Univ Calgary, Libin Cardiovasc Inst Alberta, Calgary, AB, Canada
[6] Univ Calif San Francisco, San Francisco, CA 94143 USA
[7] Univ Rochester, Med Ctr, Rochester, NY 14642 USA
[8] Univ Miami, Sch Med, Miami, FL USA
[9] Brigham & Womens Hosp, Boston, MA 02115 USA
[10] Indiana Univ, Sch Med, Indianapolis, IN USA