1. Department of Neurology, Dizziness and Vertigo Center Essen West German Headache Center University Hospital Essen University of Duisburg‐Essen Essen Germany
2. Center for Translational Neuro‐ and Behavioral Sciences University of Duisburg‐Essen Essen Germany
3. Department of Neurology Martin Luther University Halle‐Wittenberg Halle/Saale Germany
4. Department of Neurology Weser‐Egge Hospital Höxter University of Duisburg‐Essen Essen Germany