1 Division of Cardiology, London Health Sciences Centre, Department of Medicine, Western University, London, Ontario, Canada.
2 Keele Cardiovascular Research Group, Institute for Applied Clinical Science and Centre for Prognosis Research, Institute of Primary Care and Health Sciences, University of Keele, Stoke-on-Trent, UK.
3 Department of Epidemiology and Biostatistics, Western University, London, Ontario, Canada.
4 Department of Medicine, Laval University, Quebec City, Quebec, Canada.
5 Division of Cardiology, Department of Medicine, University of Washington, School of Medicine, Seattle, Washington, USA.