1. University of East Sarajevo, Faculty of Medicine, Foča, Republic of Srpska, Bosnia and Herzegovina + University Hospital, Center for Laboratory Diagnosis, Foča, Republic of Srpska, Bosnia and Herzegovina
2. University of Banja Luka, Faculty of Medicine, Banja Luka, Republic of Srpska, Bosnia and Herzegovina + University Clinical Center, Department of Pathology, Banja Luka, Republic of Srpska, Bosnia and Herzegovina
3. University of East Sarajevo, Faculty of Medicine, Foča, Republic of Srpska, Bosnia and Herzegovina
4. Public Health Hospital, Zvornik, Republic of Srpska, Bosnia and Herzegovina