1. Division of Rheumatology and Research, Diakonhjemmet Hospital, Oslo, Norway
2. Department of Internal Medicine, Päijät-Häme Central Hospital, Lahti, Finland
3. Faculty of Medicine, University of Helsinki, Helsinki, Finland
4. Institute for Molecular Medicine Finland (FIMM), HiLIFE, University of Helsinki, Helsinki, Finland
5. Clinicum, University of Helsinki, Helsinki, Finland
6. Institute of Clinical Medicine, University of Oslo, Oslo, Norway