1. Department of Orthopedics, Balgrist University Hospital, University of Zurich, Zurich, Switzerland
2. University Spine Center Zurich, Balgrist University Hospital, University of Zurich, Zurich, Switzerland
3. Spine Center, Asklepios Klinik Lindau, Lindau, Germany
4. Institute of Biomechanics, Balgrist Campus, ETH Zurich, Zurich, Switzerland
5. Spine Biomechanics, Department of Orthopedic Surgery, Balgrist University Hospital, University of Zurich, Zurich, Switzerland