1. Forschungszentrum Jülich GmbH, Nuclear Chemistry (INM-5), Institute of Neuroscience and Medicine, Wilhelm-Johnen-Straße, Jülich 52428, Germany
2. Faculty of Medicine and University Hospital Cologne, Institute of Radiochemistry and Experimental Molecular Imaging, University of Cologne, Kerpener Straße 62, Cologne 50937, Germany
3. Faculty of Medicine and University Hospital Cologne, Department of Nuclear Medicine, University of Cologne, Kerpener Straße 62, Cologne 50937, Germany
4. Faculty of Medicine and University Hospital Cologne, Center for Neurosurgery, Department of General Neurosurgery, University of Cologne, Kerpener Straße 62, Cologne 50937, Germany