Affiliation: | 1. Department of Preventive Dentistry, Periodontology and Cariology, University of G?ttingen, G?ttingen;2. Centre for Statistics, University of G?ttingen, G?ttingen;3. Department of Diagnostic Radiology, University of G?ttingen, G?ttingen;4. Department of Orthodontics, University of G?ttingen, G?ttingen, Germany |