Author(s):
1. Natasa Trtic, Medicinski fakultet Banja Luka ,
Republic of Srpska, Bosnia and Herzegovina
2. Radmila Arbutina, Medicinski fakultet Banja Luka ,
Republic of Srpska, Bosnia and Herzegovina
3. Ognjenka Janković, Medicinski fakultet Banja Luka ,
Republic of Srpska, Bosnia and Herzegovina