1. Department of Periodontology, Institute of Odontology, The Sahlgrenska Academy University of Gothenburg Gothenburg Sweden
2. Clinic of Periodontics, Public Dental Service Region Västra Götaland Gothenburg Sweden
3. Department of Behavioral and Community Dentistry, Institute of Odontology, The Sahlgrenska Academy University of Gothenburg Gothenburg Sweden
4. Department of Education, Communication and Learning, Faculty of Education University of Gothenburg Gothenburg Sweden
5. Department of Psychology, Faculty of Social Sciences University of Gothenburg Gothenburg Sweden