1. Cardiology Division, London Health Sciences Centre, Western University, Ontario, Canada (R.B.).
2. Keele Cardiovascular Research Group, Centre for Prognosis Research, Institute of Primary Care and Health Sciences, Keele University, Stoke-on-Trent, United Kingdom (R.B.).
3. Cardiology Division, Hamilton Health Sciences, McMaster University, Ontario, Canada (S.S.J.).
4. Population Health Research Institute, Hamilton, Ontario, Canada (S.S.J.).