1. Sport Science Institute, National Collegiate Athletic Association, Indianapolis, Indiana;
2. Department of Family Medicine, University of Washington, Seattle, Washington;
3. Cardiovascular Performance Program, Massachusetts General Hospital, Boston, Massachusetts;
4. Krannert Institute of Cardiology, Indiana University School of Medicine, Indianapolis, Indiana;
5. Division of Cardiology, University of Miami Miller School of Medicine, Miami, Florida;
6. American Heart Association, Dallas, Texas;
7. Division of Pediatric Cardiology, Department of Pediatrics, Baylor College of Medicine, Houston, Texas; and the
8. Division of Cardiology, Hartford Hospital, Hartford, Connecticut.