1. Faculty for Health and Business Studies, Singidunum University, 14000 Valjevo, Serbia
2. Institute of Public Health of Serbia “Dr Milan Jovanovic Batut”, Department for HIV, Hepatitis, STIs and Tuberculosis, 11000 Belgrade, Serbia
3. Faculty for Technical Science, Singidunum University, 11000 Belgrade, Serbia
4. New Jersey Institute of Technology, Electrical and Computer Engineering Center, Ewing, NJ 07102, USA