Author(s):
1. Radmila Arbutina, Medicinski fakultet Banja Luka , Republic of Srpska, Bosnia and Herzegovina
2. Nataša Trtić, Republic of Srpska, Bosnia and Herzegovina
3. Ognjenka Janković, Republic of Srpska, Bosnia and Herzegovina
4. Valentina Veselinović, University of Banja Luka, Medical Faculty, Republic of Srpska, Bosnia and Herzegovina
5. Vladan Mirjanić, Medicinski fakultet Banja Luka , Republic of Srpska, Bosnia and Herzegovina