1. Gade Laboratory for Pathology, Department of Clinical Medicine, University of Bergen, Bergen, Norway;
2. Department of Pathology, Haukeland University Hospital, Bergen, Norway;
3. Department of Oral Surgery and Oral Medicine, University of Oslo, Oslo, Norway;
4. Department of Oral Biology, University of Oslo, Oslo, Norway;
5. Broegelmann Research Laboratory, Department of Clinical Science, University of Bergen, Bergen, Norway;
6. Department of Rheumatology, Haukeland University Hospital, Bergen, Norway