1. Department of Infectious diseases, Faculty of Medical Sciences , University of Kragujevac , Serbia
2. Department of Internal medicine, Faculty of Medical Sciences , University of Kragujevac , Serbia
3. Department of Microbiology, Faculty of Medicine Foca , University of East Sarajevo , Bosnia and Herzegovina
4. Department of Otorhinolaryngology, Faculty of Medical Sciences , University of Kragujevac , Serbia
5. Center for Molecular Medicine and Stem Cell Research , Faculty of Medical Sciences , University of Kragujevac , Serbia