1. Department of Orthodontics and Dentofacial Orthopedics, Charité–Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin and Humboldt-Universität zu Berlin, 14197 Berlin, Germany
2. Department of Orthodontics and Dentofacial Orthopedics, Dental School/Medical Faculty, University of Bern, 3012 Bern, Switzerland
3. Department of Orthodontics, Faculty of Medicine Carl Gustav Carus, Technische Universität Dresden, 01307 Dresden, Germany