1. Division of Cardiology, University of Texas Southwestern Medical Center, Dallas
2. Department of Internal Medicine, University of Iowa Carver College of Medicine, Iowa City
3. Department of Medicine, Cambridge Health Alliance Hospital, Harvard Medical School, Boston, Massachusetts
4. Division of Cardiology, University of Louisville School of Medicine, Lexington, Kentucky
5. Institute of Clinical and Translational Science, University of Iowa Carver College of Medicine, Iowa City6Division of Cardiovascular Medicine, Department of Internal Medicine, University of Iowa Carver College of Medicine, Iowa City
6. Ahmanson–UCLA (University of California, Los Angeles) Cardiomyopathy Center, Ronald Reagan UCLA Medical Center