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