1. Institute of Organic Chemistry, RWTH Aachen University, Landoltweg 1, Aachen, Germany
2. Institute for Experimental Molecular Imaging, University Clinic, RWTH Aachen, Forckenbeckstrasse 55, Germany
3. DWI-Leibnitz Institute for Interactive Materials and Institute for Technical and Macromolecular Chemistry, RWTH Aachen University, Forckenbeckstrasse 50, Aachen, Germany
4. Fraunhofer Institute for Digital Medicine MEVIS, Max-von-Laue-Str. 2, 28359 Bremen, Germany