1. Department
of Experimental Molecular Imaging, University Hospital and Helmholtz Institute for Biomedical
Engineering, RWTH Aachen, Pauwelsstrasse 30, 52074 Aachen, Germany
2. Institute
of Macromolecular Chemistry, Academy of Sciences of the Czech Republic, Heyrovsky Square 2, 162 06 Prague 6, Czech Republic
3. Electron
Microscopy, Institute of Pathology, Medical Faculty, RWTH Aachen, Pauwelstrasse
30, 52074 Aachen, Germany
4. Department
of Pharmaceutics, Utrecht Institute for Pharmaceutical Sciences, Utrecht University, Universiteitsweg 99, 3584 CG Utrecht, The Netherlands
5. Department
of Controlled Drug Delivery, MIRA Institute for Biomedical Technology
and Technical Medicine, University of Twente, PO Box 217, 7500 AE, Enschede, The Netherlands