1. Department of Orthopedics, Balgrist University Hospital, University of Zurich, Zurich, Switzerland
2. University Spine Center Zürich, Balgrist University Hospital, University of Zurich, Zurich, Switzerland
3. Institute of Biomechanics, Balgrist Campus, ETH Zurich, Zurich, Switzerland
4. Spine Biomechanics, Department of Orthopedic Surgery, Balgrist University Hospital, University of Zurich, Zurich, Switzerland