1. Department of Experimental and Theoretical Neuroscience, Transylvanian Institute of Neuroscience , Str. Ploiesti 33, 400157 Cluj-Napoca , Romania
2. Faculty of Electronics, Telecommunications and Information Technology, Technical University of Cluj-Napoca , Str. Memorandumului 28, 400114 Cluj-Napoca , Romania
3. Merck KGaA , Frankfurter Straße 250, 64293 Darmstadt , Germany
4. Faculty of Physics, Babes-Bolyai University , Str. Mihail Kogalniceanu 1, 400084 Cluj-Napoca , Romania