1. University of Novi Sad, Faculty of Medicine, Novi Sad, Serbia + Dental Clinic of Vojvodina, Novi Sad, Serbia
2. University of Novi Sad, Faculty of Medicine, Novi Sad, Serbia + Clinical Centre of Vojvodina, Centre for Laboratory Medicine, Novi Sad, Serbia
3. University Bussines Academy Novi Sad, Faculty of Stomatology Pančevo, Department for Oral Surgery, Pančevo, Serbia