1. Department of Physical and Macromolecular Chemistry, Faculty of Science, Charles University, Hlavova 2030, 128 40 Prague 2, Czech Republic
2. Institute of Macromolecular Chemistry, Academy of Sciences of the Czech Republic, Heyrovský Sq. 2, 16206 Prague 6, Czech Republic
3. Institute of Organic Chemistry and Biochemistry, Center for Biomolecules and Complex Molecular Systems, Gilead Sciences and IOCB Research Center, AS CR, Flemingovo n. 2, 166 10 Prague 6, Czech Republic
4. Department of Engineering Physics, Helsinki University of Technology, Nanotalo, Puumiehenkuja 2, FI-02150 Espoo, Finland