1. Department of Clinical Neurophysiology, Georg August University, Göttingen 37075, Germany
2. Department of Diagnostic and Interventional Neuroradiology, Georg August University, Göttingen 37075, Germany
3. Institut der Kasseler Stottertherapie, Bad Emstal, Germany
4. Department of Cognitive Neurology, MR Research in Neurosciences, Georg August University, Göttingen 37075, Germany
5. Department of Neurology, Georg August University, Göttingen 37075, Germany