1. Centre for Rheumatology and Clinical Immunology, Division of Medicine, Turku University Hospital, Turku, Finland
2. Department of Medicine, University of Turku, Turku, Finland
3. Division of Rheumatology, Center of Internal Medicine and Respiratory Medicine, Oulu University Hospital, Oulu, Finland
4. Department of Biostatistics, University of Turku and Turku University Hospital, Turku, Finland
5. Cancer Research and Translational Medicine Research Unit, Medical Research Centre Oulu, Oulu, Finland
6. Division of Rheumatology, Department of Internal Medicine, Kuopio University Hospital, Kuopio, Finland