[1] Duke Univ, Div Cardiol, Sch Med, Durham, NC USA
[2] Duke Clin Res Inst, Durham, NC USA
[3] Univ Calif Los Angeles, Ahmanson UCLA Cardiomyopathy Ctr, Angeles Med Ctr, Div Cardiol, Los Angeles, CA USA
[4] Merck & Co Inc, Rahway, NJ USA
[5] Univ Colorado, Div Cardiol, Colorado Cardiovasc Outcomes Res Consortium, Sch Med, Aurora, CO USA
[6] Northwestern Univ Feinberg, Div Cardiol, Sch Med, Chicago, IL USA
[7] Nursing Inst, Cleveland Clin, Kaufman Ctr Heart Failure, Cleveland, OH USA
[8] Baylor Scott & White Res Inst, Dallas, TX USA
[9] Univ Mississippi, Dept Med, Jackson, MS USA
[10] Duke Clin Res Inst, 300 West Morgan St, Durham, NC 27701 USA