1. Department of Clinical Chemistry and Hematology; Zuyderland Medical Center; Heerlen The Netherlands
2. Laboratory for Clinical Thrombosis and Hemostasis, Department of Internal Medicine and Biochemistry; Cardiovascular Research Institute of Maastricht; Maastricht The Netherlands
3. Department of Cardiology; Zuyderland Medical Center; Heerlen The Netherlands
4. Department of Internal Medicine; Zuyderland Medical Center; Sittard The Netherlands