1. Arrhythmia Unit, Cardiology Service, University General Hospital of Alicante, Alicante Institute of Health and Biomedical Research (ISABIAL foundation) (J.L.I.C., A.I., T.B., J.S.-Q., A.G.-F., P.R.-R., S.H., R.A.F., M.A.F., M.R., J.A.Q., F.S.-G., J.G.M.M.).
2. Electrophysiology Laboratory and Arrhythmia Unit, Hospital Monteprincipe, Grupo HM Hospitales, University CEU-San Pablo, Madrid, Spain (T.B.-L., E.C., M.O., J.A.).