1. Institute for Experimental Molecular Imaging, RWTH Aachen University Hospital, 52074 Aachen, Germany
2. Electron Microscopy Facility, Institute of Pathology, RWTH University Hospital, 52074 Aachen, Germany
3. Department of Biotechnology and Nanomedicine, SINTEF Industry, 7034, Trondheim, Norway
4. Department of Pharmaceutics, Utrecht Institute for Pharmaceutical Sciences, Faculty of Science, Utrecht University, 3508 TB Utrecht, The Netherlands