1. Department of Cardiology, Asklepios Klinik St. Georg, Hamburg, Germany (K.-H.K., A.M., F.O., M.S.).
2. Hospital Clinic, University of Barcelona, Spain (J.B.).
3. Cardioangiologisches Centrum Bethanien, Frankfurt, Germany (A.F., K.R.J.C.).
4. Dr Fürnkranz’s current affiliation: Department of Cardiology, Pneumology, and Angiology, University Hospital Düsseldorf, Germany.
5. Department of Cardiology, Isala Klinieken, Zwolle, The Netherlands (A.E.).
6. Medtronic, Inc, Minneapolis, MN (K.M.B., F.J.K.).
7. Klinik für Kardiologie und Angiologie II, Universitäts-Herzzentrum Freiburg - Bad Krozingen, Bad Krozingen, Germany (T.A.).
8. Cardiologie Générale, Clinique Pasteur, Toulouse, France (J.-P.A.).
9. Abteilung für Kardiologie, Universitätsspital Basel, Switzerland (M.K., C.S.).
10. Monzino Sport Center Arrhythmia Unit, Centro Cardiologico Monzino, University of Milan, Italy (C.T.).