1. Cardiocentro Ticino Institute, Ente Ospedaliero Cantonale, Lugano, Switzerland (G.C.).
2. Faculty of Biomedical Sciences, USI, Lugano, Switzerland (G.C.).
3. ERN GUARDHEART (A.W., E.R.B., E.G., L.C., G.B.-S.).
4. Department of Clinical and Experimental Cardiology, Amsterdam UMC, University of Amsterdam, Heart Center, the Netherlands (A.W.).
5. Cardiology Clinical Academic Group, St. George’s, University of London & St. George’s University Hospitals NHS Foundation Trust, London, United Kingdom (E.R.B.).
6. Division of Cardiology, Medical University of Graz, Austria (D.S.).
7. First Department of Cardiology & Angiology, Silesian Center for Heart Disease, Zabrze, Poland (R.L.).
8. Sorbonne Universités, APHP, Cardiology Inst, ICAN, Pitié-Salpêtrière University Hospital, Paris, France (E.G.).
9. Istituto Auxologico Italiano, IRCCS, Cardiomyopathy Unit, Department of Cardiovascular, Neural & Metabolic Sciences, San Luca Hospital, Milan, Italy (L.C.).
10. Istituto Auxologico Italiano, IRCCS, Center for Cardiac Arrhythmias of Genetic Origin & Laboratory of Cardiovascular Genetics, Milan, Italy (L.C.).
11. Cardiovascular Inst, Hospital Clínic Pediatric Arrhythmia Unit, Hospital Sant Joan de Déu University of Barcelona, Spain (G.B.-S.).
12. School of Medicine, University of Belgrade, Belgrade, Serbia. Cardiology Clinic, Clinical Center of Serbia, Belgrade (T.P.).