1. Department of Physiotherapy and Occupational Therapy, Lillebaelt Hospital, Kolding, Denmark;
2. Institute of Regional Health Research, University of Southern Denmark, Odense, Denmark;
3. Department of Public Health, Aarhus University, Aarhus, Denmark;
4. DEFACTUM, Central Denmark Region, Aarhus, Denmark;
5. Department of Public Health, University of Southern Denmark, Odense, Denmark;
6. Spine Centre of Southern Denmark, Lillebaelt Hospital, Middelfart, Denmark;
7. Emergency Department, Hospital of Southern Jutland, Aabenraa, Denmark