[1] Univ Calif Los Angeles, Ctr Med, Cardiomyopathy Ctr, Los Angeles, CA 90095 USA
[2] Ohio State Univ, Div Cardiol, Columbus, OH 43210 USA
[3] Cleveland Clin Fdn, Div Nursing, Cleveland, OH 44195 USA
[4] Cleveland Clin Fdn, George M & Linda H Kaufman Ctr Heart Failure, Cleveland, OH 44195 USA
[5] Duke Univ, Ctr Med, Dept Med, Durham, NC 27706 USA
[6] Campbell Univ, Dept Clin Res, Res Triangle Pk, NC USA
[7] Northwestern Univ, Div Cardiol, Feinberg Sch Med, Chicago, IL 60611 USA
[8] Univ Calif San Diego, Dept Med, Med Ctr Hillcrest, La Jolla, CA 92093 USA
[9] Duke Univ, Ctr Med, Div Cardiol, Duke Clin Res Inst, Durham, NC 27706 USA
[10] Baylor Univ, Ctr Med, Baylor Heart & Vasc Inst, Waco, TX 76798 USA
[11] Cleveland Clin Fdn, Heart Failure Sect, Dept Cardiovasc Med, Cleveland, OH 44195 USA