1. Heart Rhythm Services & Center for Cardiovascular Innovation, Division of Cardiology, University of British Columbia, Vancouver (J.S.P., M.A., B.K.B., Z.L.).
2. Population Health Research Institute, David Braley Cardiac, Vascular and Stroke Research Institute; Thrombosis and Atherosclerosis Research Institute, Department of Health Research Methods, Evidence, and Impact, Department of Pathology & Molecular Medicine, Michael G. DeGroote School of Medicine, McMaster University, Hamilton, ON, Canada (G.P.).