1. Department of Health Research Methodology, Evidence, and Impact, McMaster University , Hamilton , Canada
2. Population Health Research Institute , Hamilton , Canada
3. Division of Cardiology, Department of Medicine, McMaster University , Hamilton , Canada
4. Division of Cardiac Surgery, Department of Surgery, McMaster University , Hamilton , Canada
5. David Braley Cardiac, Vascular and Stroke Research Institute , Room 1C1-5B, 237 Barton St. E., Hamilton, ON , Canada L8L 2X2