1. Department of Physical and Macromolecular Chemistry & Laboratory of Specialty Polymers, School of Science, Charles University in Prague, Albertov 6, 128 43 Prague 2, Czech Republic
2. Institute of Macromolecular Chemistry, Czech Academy of Sciences, Heyrovský Square 2, 162 06 Prague 6, Czech Republic
3. Department of Chemistry and Biochemistry, University of Texas at Austin, Austin, Texas 78712