1. Institute of Aerospace Medicine German Aerospace Center (DLR) Cologne Germany
2. Department of Neurology University Hospital Aachen Aachen Germany
3. Institute for Neuroradiology Hannover Medical School Hannover Germany
4. Department of Internal Medicine III, Division of Cardiology, Pneumology, Angiology, and Intensive Care University of Cologne Germany
5. Biomedical NMR Max Planck Institute for Multidisciplinary Sciences Göttingen Germany
6. Medical Faculty University of Cologne Germany