1. University of Eastern Finland ‐ Kuopio campus, Institute of Dentistry Kuopio Finland
2. Faculty of Medicine, Research Unit of Oral Health Sciences Oulu University Oulu Finland
3. Medical Research Center, Oral and Maxillofacial Department Oulu University Hospital Oulu Finland
4. Centre for Life Course Health Research, Faculty of Medicine University of Oulu Oulu Finland
5. Occupational Health Finnish Institute of Occupational Health Helsinki Finland
6. Finnish Student Health Service Turku Finland