1. Department of Oral and Maxillofacial Diseases; Helsinki University Hospital; University of Helsinki; Helsinki Finland
2. Institute of Dentistry; University of Eastern Finland; Kuopio Finland
3. Department of Oral and Maxillofacial Diseases; Kuopio University Hospital; Kuopio Finland
4. Division of Periodontology; Department of Dental Medicine; Karolinska Institutet; Huddinge Sweden
5. Laboratory, HUSLAB; Helsinki University Hospital; Helsinki Finland
6. HUCH Heart and Lung Center; Helsinki University Central Hospital; Helsinki Finland