1. Department of Research, Development & Education Department of Orthopaedics Radboud University Nijmegen Medical Centre, P. O. Box 910, 6500HB Nijmegen, The Netherlands.
2. Limb Deformity Reconstruction Unit, Department of Orthopaedics, Sint Maartenskliniek, P. O. Box 9011, 6500 GM Nijmegen, The Netherlands.
3. Limb Deformity Reconstruction Unit, Department of Orthopaedics, Sint Maartenskliniek Woerden, P. O. Box 8000, 3440 JD Woerden, The Netherlands.