1. Department of MedicineJohns Hopkins University School of Medicine Baltimore MD USA
2. Division of CardiologyUniversity of Colorado Anschutz Medical Campus Aurora CO USA
3. Center for Outcomes Research and EvaluationYale‐New Haven Hospital New Haven CT USA
4. Section of Cardiovascular MedicineDepartment of Medicine, Yale School of Medicine New Haven CT USA
5. Division of CardiologyStanford University School of Medicine Palo Alto CA USA
6. Ahmanson‐UCLA Cardiomyopathy CenterRonald Reagan‐UCLA Medical Center Los Angeles CA USA