1. Division of Angiology and Hemostasis Geneva University Hospitals and Faculty of Medicine Geneva Switzerland
2. Department of Medicine and Surgery Research Center on Thromboembolic Disorders and Antithrombotic Therapies University of Insubria Varese and Como Italy
3. Division of Clinical Epidemiology Department of Health and Community Medicine Geneva University Hospitals Geneva Switzerland
4. Department of Medicine Ottawa Hospital Research Institute University of Ottawa Ottawa ON Canada