1. Population Health Research Institute, McMaster University , 237 Barton St. E., Hamilton, Ontario L8L 2X2 , Canada
2. Department of Cardiology, University Medical Center Mainz, Johannes Gutenberg-University , Langenbeckstr. 1, Mainz 55131 , Germany
3. Uppsala Clinical Research Center, Uppsala University , Uppsala , Sweden
4. Department of Medical Sciences, Cardiology, Uppsala University , Uppsala , Sweden
5. Roche Diagnostics GmbH , Penzberg , Germany
6. Duke Clinical Research Institute, Duke University , Durham, NC , USA
7. Department of Medical Sciences, Clinical Chemistry, Uppsala University , Uppsala , Sweden