1. Univeristy Clinical Centre of the Republic of Srpska, Banja Luka, The Republic of Srpska, Bosnia and Herzegovina
2. Faculty of Medicine, University of Banja Luka, Banja Luka, The Republic of Srpska, Bosnia and Herzegovina
3. Ministry of Health and Social Welfare of the Republic of Srpska, Banja Luka, The Republic of Srpska, Bosnia and Herzegovina
4. Medical Faculty Foča, University of East Sarajevo, Foča, The Republic of Srpska, Bosnia and Herzegovina