1. Department of Physics and Biophysics, Medical University—Varna, 9000 Varna, Bulgaria
2. Department of Chemistry and Biochemistry, Medical University—Pleven, 5800 Pleven, Bulgaria
3. Institute of General and Inorganic Chemistry, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria
4. Department of Analytical and Laboratory Activities, National Center of Public Health and Analyses—Sofia, 1431 Sofia, Bulgaria
5. Department of Agrobiotechnologies, Agrobioinstitute, Agricultural Academy, 1164 Sofia, Bulgaria
6. Department of Physiology, Medical University—Varna, 9000 Varna, Bulgaria
7. Department of Chemistry, Medical University—Varna, 9000 Varna, Bulgaria
8. Institute of Chemical Engineering, Bulgarian Academy of Sciences, Acad. Georgi Bontchev Str., Bl.103, 1113 Sofia, Bulgaria