1. Department of Neurology, St. Josef-Hospital, Ruhr University Bochum, Germany
2. Department of Radiology, St. Josef-Hospital, Ruhr University Bochum, Germany
3. Department of Anesthesiology, St. Josef-Hospital, Ruhr University Bochum, Germany
4. Department of Neurology, St. Josef-Hospital, Ruhr University Bochum, Gudrunstr. 56, 44791 Bochum, Germany