1. National Reference Center for Inherited Arrhythmias of Lyon, Department of Cardiac Electrophysiology, Hôpital Cardiologique Louis Pradel, Hospices Civils de Lyon (HCL), Lyon, France (A.D., C.H., P.C.).
2. University of Lyon, Claude Bernard Lyon 1 University, MeLiS, CNRS UMR 5284, INSERM U1314, Institut NeuroMyoGène, Lyon, France (A.D., P.C.).
3. Arrhythmia Unit, Department of Cardiology, Centre Hospitalier Universitaire Vaudois (CHUV), Lausanne, Switzerland (C.H.-S., E.P.).
4. Cardiology, Arrhythmia, and Cardiac Stimulation Service, Amiens-Picardie University Hospital, Amiens, France (A.H., J.-S.H.).
5. Pediatric Cardiology Unit, Woman-Mother-Child Department, Centre Hospitalier Universitaire Vaudois (CHUV), Lausanne, Switzerland (S.B.-D.).
6. Cardiogenetic laboratory, Centre de biologie et pathologie Est, Hospices Civils de Lyon (HCL), Lyon, France (G.M., A.J.).
7. Department of Cardiology, Inselspital, Bern University Hospital, Bern, Switzerland (B.A.).