1. Division of Health and Rehabilitation, Department of Health Sciences, Luleå University of Technology, Luleå, Sweden
2. Department of Physiotherapy, Sunderby Hospital, Luleå, Sweden
3. Section of Physiotherapy, Department of Community Medicine and Rehabilitation, Umeå University, Umeå, Sweden
4. Department of Research and Development, County Council of Norrbotten, Luleå, Sweden