1. Division of CardiologyQueen’s UniversityKingston Ontario Canada
2. Section of Cardiac Electrophysiology, Department of MedicineHospital of the University of PennsylvaniaPhiladelphia Pennsylvania
3. Department of MedicineCardiovascular Division, Hospital of the University of PennsylvaniaPhiladelphia Pennsylvania
4. Arrhythmia Service, Department of MedicineHospital Guillermo Gran BenaventeConcepcion Chile