1. Department of Microbiology and ImmunologyFaculty of MedicineUniversity of Niš Niš Serbia
2. Center of Microbiology and ParasitologyPublic Health Institute Niš Niš Serbia
3. Department of Medical StatisticsFaculty of MedicineUniversity of Niš Niš Serbia
4. Center for Disease Control and PreventionPublic Health Institute Niš Niš Serbia
5. Department of DermatologyHealth Centre Niš Serbia
6. Kings College London London UK
7. Department of Microbiology and ImmunologyFaculty of MedicineUniversity of Belgrade Belgrade Serbia