1. Department of Clinical Epidemiology Leiden University Medical Center Leiden the Netherlands
2. Department of Haematology Erasmus MC Erasmus University Medical Center Rotterdam the Netherlands
3. Thrombosis Service Star‐shl Rotterdam the Netherlands
4. Department of Thrombosis and Hemostasis Leiden University Medical Center Leiden the Netherlands
5. Thrombosis Service of Amsterdam (Atalmedial) Amsterdam the Netherlands
6. Department of Medicine Red Cross Hospital Beverwijk the Netherlands
7. Thrombosis Service of Utrecht (Saltro) Utrecht the Netherlands
8. Kennisinstituut van de Federatie Medisch Specialisten Utrecht the Netherlands