1. Centre for Human Drug Research Leiden The Netherlands
2. Department of Orthopedics Leiden University Medical Center Leiden The Netherlands
3. Department of Orthopedics Alrijne Hospital Leiden The Netherlands
4. Department of Clinical Epidemiology Amsterdam Medical Centre Amsterdam The Netherlands
5. Department of Clinical Epidemiology Leiden University Medical Center Leiden The Netherlands
6. Department of Nephrology Leiden University Medical Center Leiden The Netherlands
7. Department of Anesthesiology Leiden University Medical Center Leiden The Netherlands