1. Institute for Experimental Molecular Imaging RWTH Aachen University Clinic 52074 Aachen Germany
2. John A. Paulson School of Engineering and Applied Sciences Harvard University Boston MA 02134 USA
3. Department of Radiology Brigham and Women's Hospital Harvard Medical School Boston MA 02115 USA
4. Electron Microscopy Facility Institute of Pathology RWTH Aachen University 52074 Aachen Germany
5. DWI – Leibniz Institute for Interactive Materials RWTH Aachen University Hospital 52074 Aachen Germany