1. Institute of Dentistry; University of Eastern Finland; Kuopio Finland
2. Department of Oral and Maxillofacial Surgery; North Karelia Central Hospital and Honkalampi Centre; Joensuu Finland
3. Institute of Dentistry; University of Oulu; Oulu Finland
4. Department of Oral and Maxillofacial Surgery; Kuopio University Hospital; Kuopio Finland
5. Unit of Oral Health Sciences; Medical Research Center Oulu (MRC Oulu); Oulu University Hospital and Oulu University; Oulu Finland
6. Department of Oral and Maxillofacial Surgery; Oulu University Hospital; Oulu Finland
7. Department of Health; National Institute for Health and Welfare; Helsinki Finland
8. The Living Environment and Health Unit; National Institute for Health and Welfare; Kuopio Finland
9. The Health Monitoring Unit; National Institute for Health and Welfare; Helsinki Finland