1 Department of Family Medicine and Center for Sports Cardiology, University of Washington, Seattle (J.A.D., D.M.S., L.S., M.Z.S., K.G.H.).
2 Division of Cardiology (B.J.P., T.W.C., A.L.B.), Massachusetts General Hospital, Boston.
3 Cardiovascular Performance Program (B.J.P., T.W.C., A.L.B.), Massachusetts General Hospital, Boston.
4 Division of Cardiology and Sports Cardiology BC, University of British Columbia, Vancouver, Canada (N.M.).
5 Department of Orthopedics and Rehabilitation, University of Wisconsin Madison (S.A.K.).
6 Swiss Olympic Medical Center, Lausanne University Hospital (CHUV), Switzerland (A.L.B.).
7 Institute for Sport Science, University of Lausanne (ISSUL), Switzerland (A.L.B.).
8 Division of Cardiology, Duke Heart Center, and Duke Clinical Research Institute, Duke University School of Medicine, Durham, NC (M.R.P.).
9 Department of Molecular Pharmacology & Experimental Therapeutics, Windland Smith Rice Sudden Death Genomics Laboratory (M.J.A.), Mayo Clinic, Rochester, MN.
10 Department of Cardiovascular Medicine, Division of Heart Rhythm Services, Windland Smith Rice Genetic Heart Rhythm Clinic (M.J.A.), Mayo Clinic, Rochester, MN.
11 Department of Pediatric and Adolescent Medicine, Division of Pediatric Cardiology (M.J.A.), Mayo Clinic, Rochester, MN.
12 Family and Community Medicine, The University of Alabama at Birmingham Heersink School of Medicine (I.M.A.).
13 Department of Laboratory Medicine & Pathology (J.J.M.), Mayo Clinic, Rochester, MN.
14 Sports Cardiology Program, Knight Cardiovascular Institute, Oregon Health and Science University, Portland (B.J.P.).