1. Institute of Molecular Biology “Roumen Tsanev”, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria
2. Institute for Interdisciplinary Research and Technologies, 1421 Sofia, Bulgaria
3. Institute of Information and Communication Technologies, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria
4. Faculty of Physics, Sofia University “St. Kliment Ohridski”, 1164 Sofia, Bulgaria
5. Proteros Biostructures, 82152 Martinsried, Germany