1. Oral and Maxillofacial Diseases; University of Helsinki and Helsinki University Hospital; Helsinki Finland
2. Division of Periodontology; Department of Dental Medicine; Karolinska Institutet; Huddinge Sweden
3. Departments of Oral Medicine and Periodontics; University of Washington; Seattle WA USA
4. Department of Public Health; University of Helsinki; Helsinki Finland
5. Department of Cardiology, Heart and Lung Center; Department of Medicine; Helsinki University Hospital; Helsinki Finland