1. Cardiology Department, University Hospital of Geneva, Switzerland (H.B.).
2. National Heart and Lung Institute, Imperial College London (D.K., Z.W.).
3. Imperial College Healthcare NHS Trust, London, United Kingdom (D.K.).
4. Arrhythmia and Electrophysiology Unit, Cardiology Department, Santa Maria Della Misericordia Hospital, Rovigo, Italy (F.Z.).
5. Geisinger Commonwealth School of Medicine, Geisinger heart Institute, Wilkes Barre, PA (P.V.).