1. Department of Dental Medicine; Division of Pediatric Dentistry; Karolinska Institutet; Stockholm Sweden
2. Department of Pediatric Dentistry; Eastmaninstitutet; Stockholm Sweden
3. Department of Oral and Maxillofacial Surgery; Resource Centre for Rare Oral Diseases; University Hospital; Copenhagen Denmark
4. Department of Pediatric Dentistry and Behavioral Science; Institute of Clinical Dentistry; University of Oslo; Oslo Norway
5. Orthodontic Clinic; Huddinge Sweden