1. Department of Biological Activity of Natural and Synthetic Substances, Institute of Neurobiology, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria
2. Department of Medical Chemistry and Biochemistry, Medical Faculty, Medical University—Sofia, 2 Zdrave St., 1431 Sofia, Bulgaria
3. Department of Pharmacology, Toxicology and Pharmacotherapy, Faculty of Pharmacy, Medical University, 9002 Varna, Bulgaria
4. Department of Health Care, South-West University “Neofit Rilski”, Ivan Mihailov St. 66, 2700 Blagoevgrad, Bulgaria
5. Department of Biomedical and Biotechnological Sciences, University of Catania, Via S. Sofia 89, 95123 Catania, Italy
6. Department of Clinical and Experimental Medicine, University of Messina, 98122 Messina, Italy