1. Department of Oral and Maxillofacial Diseases, University of Helsinki and Helsinki University Hospital, Helsinki, Finland
2. Department of Social Services and Health Care, City of Helsinki, Oral Health Care, Helsinki, Finland
3. Nordic Institute of Dental Materials (NIOM), Oslo, Norway
4. Department of Maxillofacial Surgery, Päijät-Häme Central Hospital, Päijät-Häme Joint Authority for Health and Wellbeing, Lahti, Finland
5. Department of Health, Ministry of Social Affairs and Health, Helsinki, Finland
6. Research Unit of Oral Health Sciences and Medical Research Center Oulu, Oulu University Hospital and University of Oulu, Oulu, Finland