1. Department of Clinical Science, University of Bergen, Bergen, Norway;
2. Oral Health Centre of Expertise in Western Norway, Bergen, Norway;
3. Department of Medicine, Haukeland University Hospital, Bergen, Norway;
4. Department of Rheumatology, Haukeland University Hospital, Bergen, Norway;
5. Department of Clinical Dentistry, University of Bergen, Bergen, Norway;
6. Molecular Pathology, Institute of Biomedical and Translational Medicine, University of Tartu, Tartu, Estonia;
7. Broegelmann Research Laboratory, Department of Clinical Science, University of Bergen, Bergen, Norway