1. Department of Orthopaedics, University Hospital Balgrist, University of Zurich, Zurich, Switzerland
2. Department of Orthopaedics and Trauma Surgery, Lucerne Cantonal Hospital, Lucerne, Switzerland
3. Faculty of Medicine, University of Zurich, Zurich, Switzerland
4. Unit of Clinical and Applied Research, Balgrist University Hospital, University of Zurich, Zurich, Switzerland