1. Department of Neurology, University Medical Center Göttingen, Georg-August University, 37075 Göttingen, Germany
2. Institute of Biomedical Engineering and Informatics, Ilmenau University of Technology, 98684 Ilmenau, Germany
3. Department of Neurology, Ludwig-Maximilians University Munich, Klinikum Großhadern, 81377 München, Germany