1. AO Research Institute Davos, Clavadelerstrasse 8, 7270 Davos Platz, Switzerland
2. Department of Orthopaedics, University Medical Center Utrecht, Utrecht University, Heidelberglaan 100, 3584 CX, Utrecht, The Netherlands
3. Department of Clinical Sciences, Faculty of Veterinary Medicine, Utrecht University, Yalelaan 1, 3584 CL, Utrecht, The Netherlands
4. Department of Developmental BioEngineering, Technical Medical Centre, University of Twente, Drienerlolaan 5, 7522 NB, Enschede, The Netherlands