1. Institute of Dentistry; University of Turku; Turku Finland
2. Department of Diagnostic Imaging Turku University Hospital; Turku Finland
3. Institute of Dentistry; University of Eastern Finland; Kuopio Finland
4. Departments of Health Functional Capacity and Welfare and Environmental Health; National Institute for Welfare and Health; Helsinki and Kuopio Finland
5. Department of Oral and Maxillofacial Surgery; Kuopio University Hospital; Kuopio Finland
6. Department of Oral and Maxillofacial Diseases; University of Helsinki; Helsinki Finland