1. University of Novi Sad, Faculty of Medicine, Dental Clinic of Vojvodina, Department of Oral Surgery, Novi Sad, Serbia + Dr. Draga Ljočić Health Center, Šabac, Serbia + University of Travnik, Faculty of Pharmacy and Health, Travnik, Federation of Bosnia and Herzegovina, Bosnia and Herzegovina
2. University of Novi Sad, Faculty of Medicine, Dental Clinic of Vojvodina, Department of Oral Surgery, Novi Sad, Serbia
3. University of Novi Sad, Faculty of Medicine, Institute of Public Health of Vojvodina, Center for Microbiology, Department of Bacteriology, Novi Sad, Serbia + University of Novi Sad, Faculty of Medicine, Department of Microbiology with Parasitology and Immunology, Novi Sad, Serbia
4. University of Belgrade, School of Dental Medicine, Belgrade, Serbia
5. University of Belgrade, Faculty of Medicine, Institute of Medical Statistics and Informatics, Belgrade, Serbia