1. Department of Pharmacy, Faculty of Medicine, University of Niš, 18000 Niš, Serbia
2. Department of Biology and Ecology, Faculty of Science and Mathematics, University of Niš, 18000 Niš, Serbia
3. Department of Sanitary Chemistry, Institute of Public Health, 18000 Niš, Serbia
4. Center of Chemistry - ICTM, University of Belgrade, Njegoševa 12, 11000 Belgrade, Serbia
5. High school “Bora Stanković”, 18000 Niš, Serbia