1. Department of Orthopedics and Trauma, Medical University of Graz, A-8036 Graz, Austria
2. Department for Rehabilitation, Ludwig Boltzmann Institute for Arthritis and Rehabilitation, A-5760 Saalfelden, Austria
3. Division of Biomedical Research, Medical University of Graz, A-8036 Graz, Austria
4. Department of Radiation Oncology, Medical University of Vienna, A-1090 Vienna, Austria