1. Department of Voice, Speech and Hearing Disorders Center for Clinical Neurosciences University Medical Center Hamburg‐Eppendorf Hamburg 20246 Germany
2. Department of Neurology University Medical Center Hamburg‐Eppendorf Hamburg 20246 Germany
3. Department of Neurophysiology and Pathophysiology University Medical Center Hamburg‐Eppendorf Hamburg 20246 Germany
4. Institute of Medical Biometry and Epidemiology University Medical Center Hamburg‐Eppendorf Hamburg 20246 Germany
5. Centre of Neurology Department for Neurodegenerative Diseases and Hertie‐Institute for Clinical Brain Research Tübingen 72076 Germany
6. Department of Neurosurgery University Medical Center Hamburg‐Eppendorf Hamburg 20246 Germany