1. Onze Lieve Vrouwe Gasthuis; Department of Orthopaedic Surgery; Postbus 95500 Amsterdam Netherlands 1090 HM
2. Academic Medical Centre; Trauma Unit, Department of Surgery; Meibergdreef 9 Amsterdam Netherlands 1105 AZ
3. York Hospital; Emergency Department; Wigginton Road York North Yorkshire UK YO31 8HE
4. Rivierenland Ziekenhuis; Department of Surgery; Postbus 6024 Tiel Netherlands 4000 HA
5. St Lucas Andreas Ziekenhuis; Department of Surgery; Amsterdam Netherlands
6. Academic Medical Center; Department of Orthopaedic Surgery; Meibergdreef 9 Amsterdam Netherlands 1105 AZ