1. Department of Pediatric Dentistry, Dental School, University of Marburg, Georg-Voigt-Str. 3, 35033 Marburg, Germany
2. Department of Orthodontics, University of Wuerzburg, 97070 Wuerzburg, Germany
3. Molecular Genetics Laboratory, Universitiy Clinics Tuebingen, 72076 Tuebingen, Germany
4. University Hospital for Paediatric and Adolescent Medicine, 69120 Heidelberg, Germany
5. Department of Ophthalmology, University of Wuerzburg, 97080 Wuerzburg, Germany