1. Center for Treatment of Rheumatic and Musculoskeletal Diseases (REMEDY), Norwegian National Advisory Unit on Rehabilitation in Rheumatology, Diakonhjemmet Hospital, Oslo, Norway
2. Institute of Health and Society, Faculty of Medicine, University of Oslo, Oslo, Norway
3. Institute of Neuroscience and Physiology, Section of Health and Rehabilitation, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
4. Department of Physiotherapy, Sahlgrenska University Hospital, Gothenburg, Sweden
5. Department of Nutrition and Public Health, University of Agder, Kristiansand, Norway