1. Department of Orthodontics, University Medical Center Groningen, University of Groningen, The Netherlands.
2. Department of Orthodontics, Cleft Palate Team, University Medical Center Groningen, University of Groningen, The Netherlands.
3. Almelo, The Netherlands.
4. Department of Oral and Maxillofacial Surgery, University Medical Center Groningen, University of Groningen, The Netherlands.
5. Department of Oral and Maxillofacial Surgery and Department of Rehabilitation, University Medical Center Groningen, University of Groningen, The Netherlands