[1] Ålesund Hospital,Department of Orthopedic Surgery
[2] Møre and Romsdal Hospital Trust,Department of Diagnostic Imaging
[3] Akershus University Hospital,Institute of Clinical Medicine
[4] University of Oslo,Kysthospitalet in Hagevik. Orthopedic Clinic
[5] Haukeland University Hospital,Department of Clinical Medicine
[6] University of Bergen,Division of Orthopedic Surgery
[7] Oslo University Hospital Ullevaal,Communication and Research Unit for Musculoskeletal Health (FORMI)
[8] Oslo University Hospital,Department of Research and Innovation
[9] Møre and Romsdal Hospital Trust,Department of Circulation and Medical Imaging, Faculty of Medicine and Health Sciences
[10] Norwegian University of Science and Technology,Department of Neurosurgery
[11] Unilabs Radiology,Department of Neurosurgery and the Norwegian Registry for Spine Surgery (NORspine)
[12] Stavanger University Hospital,Institute of Clinical Medicine
[13] University Hospital of Northern Norway,Department of Orthopedics
[14] The Arctic University of Norway,Dept of Orthopaedics
[15] Akershus University Hospital,Dept. of Orthopaedics, Institute for Clinical Sciences, Sahlgrenska Academy
[16] Sahlgrenska University Hospital,Dept. of Quality and Health Technology
[17] University of Gothenburg,undefined
[18] University of Stavanger,undefined