1. Faculty of Medicine, University of Belgrade, 8 Dr Subotica Street, 11000 Belgrade, Serbia
2. Department of Virology, Institute of Microbiology and Immunology, 1 Dr Subotica Street, 11000 Belgrade, Serbia
3. Institute for Biocides and Medical Ecology, 16 Trebevicka Street, 11000 Belgrade, Serbia
4. Clinic of Haematology, University Clinical Centre of Serbia, University of Belgrade, 2 Dr Koste Todorovica Street, 11000 Belgrade, Serbia