1. Institute of Biological Information Processing (IBI-3) Forschungszentrum Jülich 52428 Jülich Germany
2. Department of Physics University of Konstanz 78464 Konstanz Germany
3. RWTH Aachen University Aachen 52062 Germany
4. Faculty of Radio Physics Electronics and Computer Systems Taras Shevchenko National University of Kyiv Kyiv 03680 Ukraine
5. School of Biomedical Sciences Li Ka Shing Faculty of Medicine The University of Hong Kong Pokfulam, Hong Kong Special Administrative Region China