1. Department of Orthopaedic Surgery Rush University Medical Center Chicago Illinois USA
2. International Spine Research and Innovation Initiative (ISRII) Rush University Medical Center Chicago Illinois USA
3. Institute of Orthopaedic Research and Biomechanics, Centre for Trauma Research Ulm Ulm University Medical Centre Ulm Germany
4. Department of Neurosurgery, Neuroscience Institute Virginia Mason Franciscan Health Seattle Washington State USA
5. Spine Center Schulthess Klinik Zurich Switzerland