1. Institute of Experimental Morphology, Pathology and Anthropology with Museum, Bulgarian Academy of Sciences, Acad. Georgi Bonchev Str., Bl. 25, Sofia 1113, Bulgaria
2. Ilie Murgulescu Institute of Physical Chemistry, Romanian Academy, Splaiul Independentei 202, 060021 Bucharest, Romania
3. Institute of Neurobiology, Bulgarian Academy of Sciences, Acad. Georgi Bonchev Str., Bl. 23, Sofia 1113, Bulgaria
4. Faculty of Chemistry, University of Bucharest, Regina Elisabeta Blvd. 4-12, 030018 Bucharest, Romania
5. Institute of Molecular Biology “Roumen Tsanev”, Acad. Georgi Bonchev Str., Bl. 21, Sofia 1113, Bulgaria
6. “C.D. Nenitzescu” Institute of Organic and Supramolecular Chemistry of the Romanian Academy, Splaiul Independentei 202B, Bucharest, Romania