1. Department of Oral and Maxillofacial DiseasesUniversity of Helsinki and Helsinki University Hospital Finland
2. Institute of DentistryUniversity of Eastern Finland Kuopio Finland
3. Kuopio University HospitalOral and Maxillofacial Diseases Kuopio Finland
4. Division of PeriodontologyDepartment of Dental MedicineKarolinska Institutet Huddinge Sweden
5. HUCH Heart and Lung CenterHelsinki University Central Hospital Helsinki Finland