1. Institute for Biomechanics, Graz University of Technology, 8010 Graz, Austria
2. Department of Solid Mechanics, Royal Institute of Technology (KTH), 100 44 Stockholm, Sweden
3. Institute of Pathology, Medical University Graz, 8036 Graz, Austria
4. Institute for Biomechanics, Centre for Biomedical Engineering, Graz University of Technology, 8010 Graz, Austria; Department of Solid Mechanics, Royal Institute of Technology (KTH), 100 44 Stockholm, Sweden