1. Heart Centre, Department of Cardiology (A.T.B., K.V.V.L., P.J.P., A.A.M.W., C.v.d.W.), Amsterdam UMC Location AMC, University of Amsterdam, The Netherlands.
2. Amsterdam Cardiovascular Sciences, Heart Failure and Arrhythmias, The Netherlands (A.T.B., K.V.V.L., P.J.P., A.A.M.W., C.v.d.W.).
3. Department of Pediatrics, BC Children’s Hospital, University of British Columbia, Vancouver, Canada (D.K., S.F., S.S.).
4. Departments of Cardiovascular Medicine, Pediatric and Adolescent Medicine, and Molecular Pharmacology & Experimental Therapeutics, Divisions of Heart Rhythm Services and Pediatric Cardiology, Windland Smith Rice Genetic Heart Rhythm Clinic and Windland Smith Rice Sudden Death Genomics Laboratory, Mayo Clinic, Rochester, MN (J.M.B., K.T., M.J.A.).
5. Department of Cardiology, Royal Brompton Hospital, London, United Kingdom (F.R.y.N., J.T.).
6. Department of Paediatric Cardiology, Vall d’Hebron University Hospital, Barcelona, Spain (F.R.y.N.).
7. European Reference Network for Rare, Low Prevalence and Complex Diseases of the Heart: ERN GUARD-Heart (F.R.y.N., I.D., F.D., S.-A.B.C., V.P., T.R., F.S., H.S., T.T., J.T.-H., A.L., A.A.M.W., C.v.d.W.).
8. Service de Cardiologie et CRMR Maladies Cardiaques Héréditaires et Rares, APHP, Hôpital Bichat, Université Paris Cité, France (I.D., A.L.).
9. Department of Cardiology, Hospital Universitario y Politécnico La Fe, Valencia, Spain (E.Z.).
10. Unidad de Cardiopatías Familiares, Muerte Súbita y Mecanismos de Enfermedad, Instituto de Investigación Sanitaria La Fe, Valencia, Spain (E.Z.).
11. Center for Biomedical Network Research on Cardiovascular Diseases, Madrid, Spain (E.Z.).
12. Department of Pediatric Cardiology, Erasmus MC–Sophia, Rotterdam, The Netherlands (J.A.E.K.).
13. Medical Genome Center, National Cerebral and Cardiovascular Center, Suita, Japan (T.A., S.O.).
14. Department of Pediatrics, University of Alberta, Edmonton, Canada (J.A.).
15. Department of Pediatric Cardiology and Cardiac Surgery, Bambino Gesù Children’s Hospital and Research Institute, Rome, Italy (F.D.).
16. Department of Pediatrics, University of California, Irvine (A.S.B.).
17. Cardiovascular Genetics Center, Institut d’Investigació Biomèdica Girona, Hospital Trueta, CIBERCV, University of Girona, Spain (R.B.).
18. Department of Medicine, University Medical Center Mannheim, Germany (M.B.).
19. Department of Pediatric Cardiology, Emma Children’s Hospital (S.-A.B.C.), Amsterdam UMC Location AMC, University of Amsterdam, The Netherlands.
20. Department of Cardiology, University of Groningen, University Medical Centre Groningen, The Netherlands (M.G.P.J.C.).
21. The Royal Children’s Hospital, Melbourne, Australia (A.D.).
22. IWK Health Center, Dalhousie University, Halifax, Canada (S.D.).
23. Division of Pediatric Cardiology, University of Utah, Salt Lake City (S.P.E.).
24. Sibley Heart Center, Children’s Healthcare of Atlanta, GA (P.F.).
25. ProCardio Center for Innovation, Heart, Vessel and Lung Clinic, Oslo University Hospital, Rikshospitalet, Norway (K.H.).
26. Department of Cardiovascular Medicine, Shiga University of Medical Science, Otsu, Japan (M.H., S.O.).
27. Division of Pediatric Cardiology, Department of Pediatrics, Norton Children’s Hospital, University of Louisville School of Medicine, KY (C.J.).
28. University of Alabama at Birmingham (A.M.K.).
29. Department of Pediatric Cardiology and Intensive Care Medicine, University Medical Center Göttingen, Georg-August-University, Germany (U.K.).
30. Department of Paediatrics, Hong Kong Children’s Hospital, China (S.-Y.K.).
31. University of Michigan Congenital Heart Center, Ann Arbor (M.J.L.).
32. Université de Nantes, CHU Nantes, CNRS, INSERM, L’institut du Thorax, France (V.P.).
33. Section of Cardiac Electrophysiology, Division of Cardiology, Department of Medicine, Western University, London, Canada (J.D.R.).
34. Department of Cardiovascular Diseases, University Hospitals Leuven, Belgium (T.R.).
35. LIRYC Institute, Bordeaux University Hospital, Bordeaux University, France (F.S.).
36. Agnes Ginges Centre for Molecular Cardiology at Centenary Institute, University of Sydney, Australia (C.S.).
37. Cardiac Inherited Disease Group New Zealand, Green Lane Paediatric and Congenital Cardiac Services, Starship Children’s Hospital, Auckland (J.R.S.).
38. Heart and Lung Centre, Helsinki University Hospital and Helsinki University, Finland (H.S.).
39. Children’s Heart Centre, 2nd Faculty of Medicine, Charles University in Prague and Motol University Hospital, Czech Republic (T.T.).
40. Division of Cardiology, Children’s Mercy Hospital, Kansas City, MO (S.T.-D.).
41. Department of Cardiology, Rigshospitalet, Copenhagen, Denmark (J.T.-H.).
42. Section of Genetics, Department of Forensic Medicine, Faculty of Medical Sciences, University of Copenhagen, Denmark (J.T.-H.).
43. Department of Cardiology, Erasmus MC, University Medical Center Rotterdam, The Netherlands (S.-C.Y.).
44. Department of Pediatrics, Monroe Carell Jr Children’s Hospital at Vanderbilt, Vanderbilt University Medical Centre, Nashville, TN (P.J.K.).
45. Epidemiology and Data Science, Amsterdam Public Health, Methodology (M.W.T.T.), Amsterdam UMC Location AMC, University of Amsterdam, The Netherlands.