1. University of Banja Luka, Faculty of Medicine, Banja Luka, Republic of Srpska, Bosnia and Herzegovina + University Clinical Center of the Republic of Srpska, Clinic for Pulmonary Diseases, Banja Luka, 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 of the Republic of Srpska, Department of Pathology, Banja Luka, Republic of Srpska, Bosnia and Herzegovina
3. University Clinical Center of the Republic of Srpska, §Internal Clinic, Banja Luka, Republic of Srpska, Bosnia and Herzegovina