1. Department of Orthodontics and Oral Biology, University Medical Center Nijmegen, the Netherlands.
2. Department of Orthodontics and Oral Biology and Head of the Cleft Palate Craniofacial Unit, University Medical Center Nijmegen, the Netherlands.
3. Department of Preventive and Curative Dentistry, University Medical Center Nijmegen, the Netherlands.
4. Department of Orthodontics, Academic Centre for Dentistry Amsterdam, and Head of the Department of Orthodontics, Dijkzigt University Hospital, Rotterdam, the Netherlands