[1] NHLBI, Div Cardiovasc Sci, Bethesda, MD 20892 USA
[2] Mayo Clin, Div Cardiovasc Dis, Rochester, MN USA
[3] Univ Alberta, Fac Rehabil Med, Edmonton, AB, Canada
[4] Duke Univ, Sch Med, Div Cardiol, Durham, NC USA
[5] Univ Texas SW Med Ctr Dallas, Inst Exercise & Environm Med, Dallas, TX 75390 USA
[6] Brigham & Womens Hosp, Div Cardiovasc, Boston, MA 02115 USA
[7] Albert Einstein Coll Med, Div Cardiol, Bronx, NY 10467 USA
[8] Kansas State Univ, Dept Kinesiol, Manhattan, KS 66506 USA
[9] Kansas State Univ, Dept Anat & Physiol, Manhattan, KS 66506 USA
[10] Thomas Jefferson Univ, Jefferson Med Coll, Div Cardiol, Philadelphia, PA 19107 USA
[11] Wake Forest Sch Med, Dept Internal Med, Cardiol Sect, Winston Salem, NC USA
[12] Wake Forest Sch Med, Dept Internal Med, Sect Geriatr, Winston Salem, NC USA