Affiliation: | 1. Institute of Dentistry, University of Oulu, , Oulu, Finland;2. Departments of Bacteriology and Immunology, Haartman Institute of Helsinki, University of Helsinki, , Helsinki, Finland;3. Departments of Pathology and Oral Pathology, University of Helsinki and HusLab, University of Helsinki, , Helsinki, Finland;4. Oulu University Hospital, , Oulu, Finland |