1. Orthopaedic Research Laboratory, Radboud University Medical Center, 6525 GA Nijmegen, The Netherlands
2. Invibio Ltd., Thornton Cleveleys FY5 4QD, Lancashire, UK
3. Faculty of Science and Engineering, University of Groningen, 9747 AG Groningen, The Netherlands
4. Laboratory for Biomechanical Engineering, Faculty of Engineering Technology, University of Twente, 7522 NB Enschede, The Netherlands