1. MIRA - Institute of Biomedical Technology and Technical Medicine and Department of Biomaterials Science and Technology, Faculty of Science and Technology; University of Twente; PO Box 217 7500 Enschede the Netherlands
2. W.J. Kolff Institute, Department of Biomedical Engineering, University Medical Centre Groningen; University of Groningen; PO Box 196 9700 Groningen the Netherlands
3. Collaborative Research Partner; Annulus Fibrosus Rupture Program of AO Foundation; Davos Switzerland