1. Department of Prosthetic Dentistry, Faculty of Medicine Carl Gustav Carus, TU Dresden, 01307 Dresden, Germany
2. Department of Applied Mathematics, University Politehnica of Bucharest, 060042 Bucharest, Romania
3. Department of Orthodontics, Faculty of Medicine Carl Gustav Carus, TU Dresden, 01307 Dresden, Germany
4. Department of Orthodontics and Temporomandibular Disorders, University of Medical Sciences, 60-812 Poznań, Poland