1. Institute of Dentistry University of Eastern Finland KuopioFinland
2. Diagnostic Imaging Center Kuopio University Hospital KuopioFinland
3. Research Unit of Oral Health Sciences University of Oulu OuluFinland
4. Department of Oral and Maxillofacial Diseases Kuopio University Hospital KuopioFinland
5. Public Health Evaluation and Projection Unit Finnish Institute for Health and Welfare (THL) Helsinki Finland