1. Arrhythmia Division, Department of Cardiology and Angiology (A.S.J., H.L., J.S., V.M., J.M., C.-I.P., C.P., J.A., W.H., C.H.-S., Y.E.O., F.-J.N., R.W., T.A.) and Department of Anesthesiology (C.K.), University Heart Center Freiburg-Bad Krozingen, Bad Krozingen, Germany; Arrhythmia Department, University Hospital Haut-Leveque Bordeaux, Pessac, France (A.D., P.J., M.H., M.H.); and Arrhythmia Division, St. Jude Medical, St. Paul, MN (S.K.).