1. Department of Prosthodontics, School of Dentistry, “Carolinum”, Goethe-University Frankfurt/Main, Frankfurt/Main, Germany
2. Department of Orthodontics, School of Dentistry, Goethe-University, Frankfurt/Main, Germany
3. Gesellschaft für Biomechanik Münster, Münster, Germany
4. Department of Orthodontics, School of Dentistry, University Medical Centre of the Johannes Gutenberg University Mainz, Mainz, Germany
5. Institute of Occupational Medicine, Social Medicine and Environmental Medicine, Goethe-University Frankfurt/Main, Frankfurt/Main, Germany