1. Medical Microbiology and Immunology, Research Unit of Biomedicine University of Oulu Oulu Finland
2. Medical Research Center Oulu University Hospital and University of Oulu Oulu Finland
3. Oral and Maxillofacial Diseases University of Helsinki and Helsinki University Hospital Helsinki Finland
4. Institute of Dentistry University of Eastern Finland Kuopio Finland
5. Division of Periodontology Department of Dental Medicine Karolinska Institutet Huddinge Sweden
6. HUCH Heart and Lung Center Helsinki University Hospital Helsinki Finland