1. From the Electrophysiology Service at the Montreal Heart Institute, Department of Medicine, Université de Montréal, Montreal, Québec, Canada (J.G.A., P.K., M.D., D.R., M.T., L.R., B.T., P.G.G., S.N., L.M.); Department of Medicine, University of British Columbia, Vancouver, British Columbia, Canada (J.G.A., M.D.); and Arrhythmia and Ablation Center, Department of Cardiology, Florida Hospital, Orlando, FL (S.J.P., G.M.).