1. Leviev Heart Center, Sheba Medical Center and Sackler School of Medicine, Tel Aviv University, Israel (D.L., Y.W., M.A.).
2. Cardiomyopathy Unit, Hospital Universitari de Bellvitge, Barcelona, Spain (J.S.-M.).
3. Health in Code, Spain (J.S.-M.).
4. Department of Cardiology, Odense University Hospital, Denmark (J.M.).
5. Department of Cardiology, University College Dublin School of Medicine, Mater Misericordiae University Hospital, Ireland (F.R., W.A., J.G.).
6. Unit of Inherited Diseases, Onassis Cardiac Surgery Center, Athens, Greece (A.A.).
7. Great Ormond Street Hospital Center for Inherited Cardiovascular Diseases, University College London Institute of Cardiovascular Science, United Kingdom (J.K.).
8. European Reference Network for Rare and Low Prevalence Complex Diseases of the Heart (J.K., P.G.-P., P.C., A.B., G.L.).
9. Department of Cardiology, Hospital Universitario Puerta de Hierro Majadahonda, CIBERCV, Madrid, Spain (P.G.-P.).
10. Universidad Francisco de Vitoria, Pozuelo de Alarcón, Spain (P.G.-P.).
11. Cardiomyopathy Unit, Careggi University Hospital, Florence, Italy (I.O.).
12. Sorbonne Université, Paris, France (P.C.).
13. APHP, Centre de référence des maladies cardiaques héréditaires ou rares, Paris, France (P.C.).
14. INSERM UMR S1166, ICAN, Paris, France (P.C.).
15. Hôpital Pitié-Salpêtrière, Paris, France (P.C.).
16. Cardio-Thoracic-Vascular Department, S. Orsola Hospital, University of Bologna, Bologna, Italy (E.B.).
17. Pediatric Cardiology and Arrhythmia/Syncope Units, Bambino Gesù Children Hospital and Research Institute, Rome (A.B.).
18. Monaldi Hospital, AO Colli, Second University of Naples, Italy (G.L.).
19. Inherited Heart Diseases Unit and CaFaMuSMe Research Group, Hospital Universitari i Politècnic La Fe and IIS La Fe, Valencia and Center for Biomedical Network Research on Cardiovascular Diseases (CIBERCV), Madrid, Spain (E.Z.).
20. Department of Cardiology, ASST Papa Giovanni XXIII, Bergamo, Italy (A.I.).
21. Health in Code, Hospital Marítimo de Oza, As Xubias, A Coruña, Spain (L.M.).
22. Hypertrophic Cardiomyopathy Center, Policlinico di Monza, Italy (P.S.).
23. Molecular Genetics Laboratory, A.O. Papa Giovanni XXIII, Bergamo, Italy (M.I.).