1. Section for Orthodontics, Department of Dentistry and Oral Health Aarhus University Aarhus Denmark
2. Department of Oral and Maxillofacial Surgery Aarhus University Hospital Aarhus Denmark
3. Harvard School of Dental Medicine and Harvard Medical School Boston Massachusetts USA
4. Department of Plastic and Oral Surgery, Boston Children's Hospital Boston Massachusetts USA
5. Section of Oral and Maxillofacial Surgery and Oral Pathology, Department of Dentistry and Oral Health Aarhus Univerisity Aarhus Denmark
6. Department of Paediatric Oral Heath and Orthodontics University Centre for Dental Medicine UZB University of Basel Basel Switzerland