1 Department of Medicine, Heart Rhythm Service, Clinical Electrophysiology and Pacing, Kingston General Hospital, Queen's University, 76 Stuart Street, Kingston, ONT, Canada K7L 2V7.
2 Centro de Arritmias Cardíacas de la Ciudad de Buenos Aires, Division of Cardiology, Hospital J. M. Ramos Mejía, Buenos Aires C1221ADC, Argentina.
3 Department of Medicine, Heart Rhythm Service, Clinical Electrophysiology and Pacing, Kingston General Hospital, Queen's University, 76 Stuart Street, Kingston, ONT, Canada K7L 2V7 [email protected].