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| Norway | |||||
| Haukeland University Hospital | |||||
| Bergen, Norway, 5021 | |||||
| Ullevål University Hospital, Orthopedic Centre | |||||
| Oslo, Norway, 0407 | |||||
| Stavanger University Hospital | |||||
| Stavanger, Norway, 4068 | |||||
| University Hospital of Nothern-Norway | |||||
| Tromsø, Norway, 9038 | |||||
| St.Olavs Hospital, NSSL | |||||
| Trondheim, Norway, 7005 | |||||
| Ullevaal University Hospital |
| The Royal Norwegian Ministry of Health |
| St. Olavs Hospital |
| University of Tromso |
| Haukeland University Hospital, Dept of neck and back diseases |
| Haukeland University Hospital |
| Stavanger University Hospital |
| Falun Hospital, Peter Fritzell, Sweden |
| Study Director: | Kjersti Storheim, PT, PhD | Orthopedic Centre, Ullevål University Hospital / NAR |