1. Department of Orthopaedic Surgery, Oslo University Hospital, Oslo, Norway
2. Department of Radiology and Nuclear Medicine, Oslo University Hospital, Oslo, Norway
3. Department of Orthopaedic Surgery, Akershus University Hospital, Lørenskog, Norway
4. Division of Neurosciences and Orthopaedics, University Hospital of North Norway, Tromsø, Norway
5. Department of Clinical Medicine, University of Tromsø – Arctic University of Norway, Tromsø, Norway
6. Faculty of Medicine, University of Oslo, Blindern, Norway