1. Department of Cariology, Endodontology and Paediatric Dentistry, Research Unit of Oral Health Sciences, University of Oulu, Oulu, Finland
2. Dental Teaching Unit, City of Oulu, Finland
3. Department of Community Dentistry, Institute of Dentistry, University of Turku, Turku, Finland
4. Center for Life Course Health Research, University of Oulu, Oulu, Finland
5. Medical Research Center, Oulu University Hospital and University of Oulu, Oulu, Finland