1. Institute of Macromolecular Chemistry, Academy of Sciences of the Czech Republic, Heyrovsky Sq. 2, CZ-16206 Prague, Czech Republic
2. CNRS UMR8612 Institut Galien Paris-Sud, Université Paris Sud 11, F-92296 Châtenay-Malabry, France
3. Laboratory for Soft Matter Electron Microscopy, Bayreuth Institute of Macromolecular Research, University of Bayreuth, D-95440 Bayreuth, Germany