1. Institute of Public Health of Serbia Dr Milan Jovanovic Batut , Department for Monitoring and Prevention of Risk Behaviour , Milke Grgurove 5 , Belgrade , Serbia
2. Clinic for Pediatric and Preventive Dentistry, School of Dental Medicine , University of Belgrade , Belgrade , Serbia
3. Clinic of Orthodontics, School of Dental Medicine , University of Belgrade , Belgrade , Serbia
4. Department of Pediatric and Preventive Dentistry, Dentistry Clinic of Vojvodina, Faculty of Medicine , University of Novi Sad , Novi Sad , Serbia
5. Ministry of Health Republic of Serbia , Belgrade , Serbia
6. University of Defense, Faculty of Medicine of the Military Medical Academy , Clinic of Stomatology , Belgrade , Serbia