1. Department of Biotechnology, Faculty of Chemical and System Engineering, University of Chemical Technology and Metallurgy, Sofia, Bulgaria
2. Department of Pathology, Institute of Experimental Morphology, Pathology and Anthropology with Museum, Bulgarian Academy of Sciences, Sofia, Bulgaria
3. Testing Center Global Test Ltd, Sofia, Bulgaria
4. Department of Organic Chemistry, Faculty of Chemical Technologies, University of Chemical Technology and Metallurgy, Sofia, Bulgaria