1. Division of Mathematics, Department of Mathematics and Computer Science, University of Cologne, Cologne, Germany.
2. Department of Nuclear Medicine, Multimodal Neuroimaging Group, Medical Faculty and University Hospital, University of Cologne, Cologne, Germany.
3. Research Center Juelich, Institute of Neuroscience and Medicine (INM-3), Cognitive Neuroscience, Juelich, Germany.
4. Institute for Geophysics and Meteorology, University of Cologne, Cologne, Germany.
5. Department of Neurology, Medical Faculty and University Hospital, University of Cologne, Cologne, Germany
6. Research Center Juelich, Institute of Neuroscience and Medicine (INM-3), Radiochemistry, Juelich, Germany.
7. Department of Neurology and clinical Neurophysiology, Helios University Hospital Wuppertal, Wuppertal, Germany.
8. Faculty of Health, Witten/Herdecke University, Witten, Germany.
9. Research Center Juelich, Institute of Neuroscience and Medicine (INM-4), Medical Imaging Physics, Juelich, Germany.
10. German Center for Neurodegenerative Diseases (DZNE), Bonn, Germany.
11. Research Center Juelich, Institute of Neuroscience and Medicine (INM-2), Molecular Organization of the Brain, Juelich, Germany.