[1] Duke Clin Res Inst, Dept Cardiol, Durham, NC 27701 USA
[2] North Carolina State Univ, Dept Stat, Raleigh, NC 27695 USA
[3] Univ Colorado, Dept Med, Aurora, CO 80045 USA
[4] St Lukes Mid Amer Heart Inst, Dept Cardiovasc Res, Kansas City, MO USA
[5] Thomas Jefferson Univ, Dept Cardiol, Sidney Kimmel Med Coll, Philadelphia, PA 19107 USA
[6] Univ Calif Los Angeles, Dept Med, Los Angeles, CA 90095 USA
[7] Yale Univ, Dept Med, Div Res, Sch Med, New Haven, CT 06510 USA
[8] Kaiser Permanente Northern Calif, Div Res, Oakland, CA 94612 USA
[9] Mayo Clin, Dept Cardiol, Coll Med, Rochester, MN 55905 USA
[10] Lankenau Inst Med Res, Dept Cardiol, Wynnewood, PA 19096 USA
[11] Stanford Sch Med, Stanford Ctr Clin Res, Dept Med, Stanford, CA 94305 USA
[12] Penn State Univ, Dept Cardiol, Hershey, PA 17033 USA
[13] Columbia Univ, Coll Phys & Surg, Dept Cardiol, New York, NY 10032 USA
[14] Harvard Med Sch, Dept Cardiol, Boston, MA 02114 USA
[15] Massachusetts Gen Hosp, Boston, MA 02114 USA
[16] Univ Utah, Dept Cardiol, Hlth Sci Ctr, Salt Lake City, UT 84112 USA