1. Institute for Laboratory Diagnostics “Konzilijum,” Belgrade, Serbia.
2. Department of Microbiology and Immunology, Faculty of Pharmacy, University of Belgrade, Belgrade, Serbia.
3. City Institute of Public Health of Belgrade, Belgrade, Serbia.
4. University Hospital Center “Dr Dragiša Mišović-Dedinje,” Belgrade, Serbia.
5. Faculty of Medicine, Institute of Microbiology and Immunology, University of Belgrade, Belgrade, Serbia.