1. Ted Rogers Cardiac Genome Clinic (S.M.H., R.K., R.J., E.L., S.B.), The Hospital for Sick Children, Toronto, Ontario, Canada.
2. Division of Clinical and Metabolic Genetics (R.K., G.C., R.J., E.L., S.M.J., S.B.), The Hospital for Sick Children, Toronto, Ontario, Canada.
3. Fred A. Litwin Family Center in Genetic Medicine, University Health Network, Toronto, Ontario, Canada (R.K., M.S., C.F.M.).
4. Toronto General Hospital Research Institute, University of Toronto, Ontario, Canada (S.U., M.H.G.).
5. Invitae Corporation, San Francisco, CA (J.G.).
6. Peter Munk Cardiac Centre, Department of Medicine (M.C., M.H.G.), Toronto General Hospital, University of Toronto, Ontario, Canada.
7. Geisinger Health System Genomic Medicine Institute, Danville, PA (A.C.S.).
8. Centro Benito Stirpe per la Morte Improvvisa del Giovane Atleta, Fondazione Policlinico Universitario Agostino Gemelli, Catholic University of the Sacred Heart, Rome, Italy (V.N.).
9. Departments of Cardiovascular Diseases, Pediatrics, and Molecular Pharmacology and Experimental Therapeutics, Divisions of Heart Rhythm Services and Pediatric Cardiology, Windland Smith Rice Sudden Death Genomics Laboratory, Rochester, MN (M.J.A.).
10. National Heart and Lung Institute, MRC London Institute of Medical Sciences, Imperial College London, Royal Brompton & Harefield Hospitals, United Kingdom (J.S.W.).
11. Department of Internal Medicine, Division of Human Genetics and Cardiovascular Division, Ohio State University, Columbus (R.E.H.).
12. AMC Heart Center, Department of Clinical and Experimental Cardiology, Academic Medical Center, Amsterdam, The Netherlands (A.A.M.W.).
13. Princess Al-Jawhara Al-Brahim Centre of Excellence in Research of Hereditary Disorders, Jeddah, Saudi Arabia (A.A.M.W.). Columbia University Irving Medical Centre, New York (A.A.M.W.).
14. Department of Physiology, Peter Munk Cardiovascular Molecular Medicine Laboratory (M.H.G.), Toronto General Hospital, University of Toronto, Ontario, Canada.