1. Linköping University Norrköping Sweden
2. Linköping University Linköping Sweden
3. Karolinska University Hospital and Karolinska Institutet Stockholm Sweden
4. Rigshospitalet and University of Copenhagen Copenhagen Denmark
5. Karolinska Institutet Huddinge Sweden
6. Swedish Rheumatism Association Stockholm Sweden
7. Umeå University Umeå Sweden
8. Diakonhjemmet Hospital Vinderen Oslo Norway
9. Örebro University Örebro Sweden
10. Karolinska Institutet, Huddinge, Sweden, and Danderyd Hospital Corporation Stockholm Sweden