1. National Advisory Unit on Rehabilitation in Rheumatology, Diakonhjemmet Hospital, and Institute of Health and Society, University of Oslo; Oslo Norway
2. National Advisory Unit on Rehabilitation in Rheumatology, Diakonhjemmet Hospital, and Norwegian Institute of Public Health; Oslo Norway
3. National Advisory Unit on Rehabilitation in Rheumatology, Diakonhjemmet Hospital; Oslo Norway
4. Norwegian Institute of Public Health; Oslo Norway