1. Department of Clinical Epidemiology Leiden University Medical Center Leiden The Netherlands
2. Department of Pharmacy Amsterdam University Medical Centers – Location AMC, University of Amsterdam Amsterdam The Netherlands
3. Anticoagulation Clinic Leiden Leiden The Netherlands
4. Department of Internal Medicine, Division of Thrombosis and Hemostasis Leiden University Medical Center Leiden The Netherlands
5. Department of Thrombosis and Anticoagulation Atalmedial Medical Diagnostics Centers Amsterdam The Netherlands