1. University of Belgrade, Faculty of Dental Medicine, Department of Orthodontics, Belgrade, Serbia
2. Sapienza Universita di Roma, Dipartimento di Scienze Odontostomatologiche e Maxillo Facciali, Roma, Italy
3. University of Belgrade, Faculty of Dental Medicine, Department of Prosthodontics, Belgrade, Serbia
4. Military Medical Academy, Clinic for Dental Medicine, Belgrade, Serbia + University of Defence, Faculty of Medicine of the Military Medical Academy, Belgrade, Serbia
5. National and Kapodistrian University of Athens, Department of Orthodontics, Athens, Greece