1. Faculty of Medicine and University Hospital, Center for Neurosurgery, Department of General Neurosurgery University of Cologne Cologne Germany
2. Faculty of Human Sciences, Department of Rehabilitation and Special Education University of Cologne Cologne Germany
3. Faculty of Medicine and University Hospital, Department of Neurology University of Cologne Cologne Germany
4. Juelich Research Centre Institute of Neuroscience and Medicine (INM‐3) Juelich Germany