1. 800 Department of Orthopaedics, University Hospital Nijmegen, P.O. Box 9101, Nijmegen 6500 HB, The Netherlands
2. Department of Pathology, University Hospital Nijmegen, Nijmegen, The Netherlands
3. Department of Radiology, University Hospital Nijmegen, Nijmegen, The Netherlands
4. Department of Orthopaedics, Tilburg, The Netherlands
5. Twee Steden Hospital, Tilburg, The Netherlands