1. Institute for Experimental Molecular Imaging (ExMI); RWTH Aachen University Clinic and Helmholtz Institute for Biomedical Engineering; Pauwelsstrasse 30 52074 Aachen Germany
2. Electron Microscopic Facility; University Hospital RWTH; Pauwelsstrasse 30 52074 Aachen Germany
3. DWI−Leibniz Institute for Interactive Materials; RWTH Aachen University; Forckenbeckstrasse 50 52056 Aachen Germany