1. Department of Community Medicine and Rehabilitation , Rehabilitation Medicine, Umeå University , Umeå , Sweden
2. Department of Community Medicine and Rehabilitation , Physiotherapy, Umeå University , Umeå , Sweden
3. Department of Health, Medicine and Caring Sciences , Physiotherapy, Linköping University , Linköping , Sweden
4. Pain and Rehabilitation Centre and Department of Health , Medicine and Caring Sciences, Linköping University , Linköping , Sweden
5. Department of Epidemiology and Global Health , Umeå University , Umeå , Sweden