Author(s):
1. Vladan Mirjanić, Medicinski fakultet Banja Luka , Republic of Srpska, Bosnia and Herzegovina
2. Đorđe Mirjanić, JZU Dom zdravlja Banja Luka , Republic of Srpska, Bosnia and Herzegovina
3. Jovan Vojinović, University Business Academy Novi Sad, Faculty of Dental Medicine in Pancevo, Republic of Srpska, Bosnia and Herzegovina