1. Institute of Pharmacology of Natural Products & Clinical Pharmacology
2. Institute of Biophysics
3. Institute of Applied Physics and Center for Functional Nanostructures, Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany
4. Department of Physics, University of Illinois at Urbana−Champaign, Illinois 61801, United States
5. Max-Planck-Institute for Polymer Research, Mainz, Germany