1. Department of Behavioral and Community Dentistry, Institute of Odontology, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden;
2. Department of Oral and Maxillofacial Surgery, Institute for Postgraduate Dental Education, Region Jönköping County, Jönköping, Sweden;
3. Department of Psychology, University of Gothenburg, Gothenburg, Sweden;
4. Clinic of Special Care Dentistry and Oral Medicine, Public Dental Service, Region Västra Götaland, Gothenburg, Sweden