1. Department of Neurology, Ruhr University Bochum, St. Josef-Hospital, Bochum, Germany
2. Department of Neurology, Bergmannsheil University Hospital, Ruhr University Bochum, Bochum, Germany
3. Department of Neurology, Ruhr University Bochum, St. Josef-Hospital, Gudrunstrasse 56, Bochum 44791, Germany