1 Division of Cardiology, Duke University School of Medicine, Durham, North Carolina; Duke Clinical Research Institute, Durham, North Carolina.
2 Duke Clinical Research Institute, Durham, North Carolina.
3 Division of Cardiology, Ahmanson-UCLA Cardiomyopathy Center, University of California Los Angeles Medical Center, Los Angeles, California.
4 Cytokinetics, South San Francisco, California.
5 Division of Cardiology, University of Colorado School of Medicine, Aurora, Colorado; Colorado Cardiovascular Outcomes Research Consortium, University of Colorado School of Medicine, Aurora, Colorado.
6 Division of Cardiology, Northwestern University Feinberg School of Medicine, Chicago, Illinois.
7 Nursing Institute; George M. and Linda H. Kaufman Center for Heart Failure, Cleveland Clinic, Cleveland, Ohio.