1. Department of Oral and Maxillofacial Diseases, University of Helsinki and Helsinki University Hospital, Helsinki, Finland;
2. Department of Bacteriology and Immunology, University of Helsinki and Helsinki University Hospital, Helsinki, Finland;
3. Department of Rheumatology, University of Helsinki and Helsinki University Hospital, Helsinki, Finland;
4. Department of Radiology, University of Helsinki and Helsinki University Hospital, Helsinki, Finland;
5. Immunopharmacology Research Group, University of Tampere School of Medicine and Tampere University Hospital, Tampere, Finland;
6. Department of Dental Medicine, Karolinska Institute, Huddinge, Sweden