1. From the Department of Cardiology, Arrhythmia Unit, INCLIVA Foundation, Hospital Clínico Universitario, Valencia, Spain (A.F.-d.-L.-O., M.I.-d.-F, A.M., P.L.-M., C.N., L.B.-S., J.M.S.-G., F.J.C.-G., R.R.-G.); Department of Cardiology, Arrhythmia Unit, Hospital General Universitario, Valencia, Spain (A.G.-F., A.I.-C., M.A.-F., J.G.M.-M.); and Department of Cardiology, Arrhythmia Unit, Hospital Universitario de San Juan, Alicante, Spain (J.C.-C., J.M.-A., V.B.-G.).