1. Utrecht Traumacenter, Utrecht, the Netherlands
2. Department of Surgery, University Medical Center Utrecht, Utrecht, the Netherlands
3. Department of Surgery, Meander Medical Center, Amersfoort, the Netherlands
4. Department of Surgery, Diakonessenhuis, Utrecht, the Netherlands
5. Department of Orthopedic Surgery, University Medical Center Utrecht, Utrecht, the Netherlands
6. Department of Epidemiology, Julius Center for Health Sciences and Primary Care, University Medical Center Utrecht, Utrecht, the Netherlands
7. Department of Orthopedic Surgery, SpaarneGasthuis, Hoofddorp, the Netherlands
8. Department of Surgery, St Antonius Hospital, Nieuwegein, the Netherlands