1. Radiation Protection Department, Radiation Protection Center, Serbian Institute of Occupational Health “Dr Dragomir Karajovic”, Belgrade, Serbia;
2. Center for Endocrine Surgery, Clinical Center of Serbia, Faculty of Medicine, University of Belgrade, Belgrade, Serbia;
3. Institute for Microbiology and Immunology, Faculty of Medicine, University of Belgrade, Belgrade, Serbia;
4. Faculty of Applied Ecology, Singidunum University, Belgrade, Serbia;
5. Occupational Health Department, Faculty of Medicine, University of Belgrade, Belgrade, Serbia