1. Institute of Dentistry; University of Helsinki; Helsinki Finland
2. Division of Periodontology; Department of Dental Medicine; Karolinska Institutet; Huddinge Sweden
3. Departments of Periodontics and Oral Medicine; University of Washington; Seattle WA USA
4. Department of Periodontology; University of Bern; Bern Switzerland
5. Oral Health Sciences; University of Kristianstad; Kristianstad Sweden
6. Division of Cardiology; Department of Medicine; Helsinki University Central Hospital; Helsinki Finland