1. Department of Neurology Medical Faculty University Hospital of Köln Köln Germany
2. Georgetown University Medical School Washington DC USA
3. Institute for Virology Medical Faculty University Hospital of Köln KölnGermany
4. Department of Haematology Medical Faculty University Hospital of Köln KölnGermany
5. Department of Haematology University Hospital Essen EssenGermany
6. Institute for Virology Medical Faculty University Hospital of Düsseldorf Düsseldorf Germany
7. Department of Neurology University Medical Center Zürich Zürich Switzerland
8. Department of Radiology Medical Faculty University Hospital of Köln KölnGermany
9. Cognitive Neuroscience Institute of Neuroscience and Medicine (INM‐3) Research Centre Jülich JülichGermany
10. Department of Diagnostic and Interventional Neuroradiology Hannover Medical School Hannover Germany