1. University of Belgrade, Faculty of Mining and Geology, Belgrade, Serbia
2. University of Kragujevac, Faculty of Science, Kragujevac
3. University of Belgrade, Faculty of Chemistry, Belgrade
4. University of Kragujevac, Faculty of Medicinal Science, Department of Internal medicine, Kragujevac, Serbia
5. University of Kragujevac, Institute for Information Technologies Kragujevac, Kragujevac, Serbia