1. Division of Hemostasis and Thrombosis, Department of Hematology, University of Groningen, University Medical Center Groningen, Groningen, the Netherlands2Certe Thrombosis Service Groningen, Groningen, the Netherlands
2. Department of Internal Medicine, Medical Center Leeuwarden, Leeuwarden, the Netherlands
3. Division of Hemostasis and Thrombosis, Department of Hematology, University of Groningen, University Medical Center Groningen, Groningen, the Netherlands
4. University Center for Geriatric Medicine, University of Groningen, University Medical Center Groningen, Groningen, the Netherlands
5. Department of Epidemiology, University of Groningen, University Medical Center Groningen, Groningen, the Netherlands