1. Department of Medicine III, Medical Faculty, RWTH Aachen, Pauwelsstr. 30, 52074 Aachen, Germany
2. DWI e.V. and Institute of Technical and Macromolecular Chemistry, RWTH Aachen, Forckenbeckstr. 50, 52056 Aachen, Germany
3. Electron Microscopic Facility (EMF), Medical Faculty, RWTH Aachen, Pauwelsstr. 30, 52074 Aachen, Germany
4. Department and Chair for Functional Materials in Medicine and Dentistry, University Hospital Würzburg, Pleicherwall 2, 97070 Würzburg, Germany
5. Department of Experimental Molecular Imaging (ExMI), Helmholtz Institute for Biomedical Engineering, Medical Faculty, RWTH Aachen, Pauwelsstr. 30, 52074 Aachen, Germany
6. Institute of Pathology, Medical Faculty, RWTH Aachen, Pauwelsstr. 30, 52074 Aachen, Germany
7. Department of Targeted Therapeutics, MIRA Institute for Biomedical Technology and Technical Medicine, University of Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands