[1] Umeå University,Department of Diagnostics and Intervention, Division of Orthopedics, Sunderby Research Unit – Norrbotten
[2] Umeå University,Department of Public Health and Clinical Medicine, Sunderby Research Unit – Norrbotten
[3] Medical University,Department of Orthopaedic Surgery and Musculoskeletal Traumatology
[4] Lund University,Department of Clinical Sciences Lund, Clinical Epidemiology Unit, Orthopedics