1. Stratingh Institute Centre for Systems Chemistry University of Groningen Nijenborgh 4 9747 AG Groningen (The Netherlands
2. Dutch Polymer Institute P. O. Box 902 5600 AX Eindhoven (The Netherlands
3. University Medical Center Groningen Department of Biomedical Engineering-FB40 and W. J. Kolff Institute for Biomedical Engineering and Materials Science-FB41 University of Groningen A. Deusinglaan 1 9713 AV Groningen (The Netherlands
4. Physical Chemistry and Soft Matter Wageningen University Stippeneng 4 6708 WE Wageningen (The Netherlands
5. Stratingh Institute and Zernike Institute for Advanced Materials University of Groningen Nijenborgh 4 9747 AG Groningen The Netherlands