1. Department of Global Public Health and Primary Care University of Bergen Bergen Norway
2. Department of Health and Function Western Norway University of Applied Sciences Bergen Norway
3. Department of Health and Social Sciences Western Norway University of Applied Sciences Bergen Norway
4. Centre of Competence on Clinical Research Haukeland University Hospital Bergen Norway
5. Department of Orthopaedic Surgery Haukeland University Hospital Bergen Norway
6. Department of Clinical Medicine University of Bergen Bergen Norway