1. Department of Clinical Epidemiology, Leiden University Medical Center, Leiden, the Netherlands
2. Department of Orthopedics, Leiden University Medical Center, Leiden, the Netherlands
3. Department of Trauma Surgery, Leiden University Medical Center, Leiden, the Netherlands
4. Medical Statistics, Department of Biomedical Datascience, Leiden University Medical Center, Leiden, the Netherlands
5. Department of Thrombosis and Haemostasis, Leiden University Medical Center, Leiden, the Netherlands