1. Medical Center Bežanijska Kosa, Faculty of Medical Sciences, University of Belgrade, 11000 Belgrade, Serbia
2. Audit, Accounting, Financial and Consulting Service Company “Moodys Standards” Ltd., 11000 Belgrade, Serbia
3. Faculty of Organizational Science, University of Belgrade, 11000 Belgrade, Serbia
4. Pharmacy Institution “Zdravlje Lek”, 11000 Belgrade, Serbia