1. Municipal Dental Service for Children and Adolescents, Copenhagen, Denmark;
2. Department of Pediatrics, Child Protection Centre, Aarhus University Hospital, Aarhus, Denmark;
3. Department of Paediatric Dentistry, University of Central Lancashire Dental School, Preston, UK;
4. Section for Paediatric Dentistry, Department of Dentistry and Oral Health, Aarhus University, Aarhus, Denmark