Author(s):
1. Dragana Malivuk Gak, Prirodno-matematički fakultet Banja Luka, Republic of Srpska, Bosnia and Herzegovina
2. Zoran Rajilic, Republic of Srpska, Bosnia and Herzegovina
3. Enes Škrgić, Federation of Bosnia and Herzegovina , Bosnia and Herzegovina
4. Saša Nježić, Medicinski fakultet Banja Luka , Republic of Srpska, Bosnia and Herzegovina