1. Military Medical Academy, Clinic of Dental Medicine, Belgrade, Serbia + University of Defence, Faculty of Medicine of the Military Medical Academy, Belgrade, Serbia
2. Health Center Banja Luka, Banja Luka, Republic of Srpska, Bosnia and Herzegovina
3. University of Banja Luka, Faculty of Medicine, Banja Luka, Republic of Srpska, Bosnia and Herzegovina
4. University of Defence, Faculty of Medicine of the Military Medical Academy, Belgrade, Serbia + Military Medical Academy, Clinic for Oral Surgery, Belgrade, Serbia
5. University of Niš, Faculty of Medicine, Niš, Serbia
6. University of Defence, Faculty of Medicine of the Military Medical Academy, Belgrade, Serbia + Military Medical Academy, Clinic for Maxillofacial Surgery, Belgrade, Serbia