1. Department of Neurology, Huntington Center North Rhine-Westphalia, Ruhr-University Bochum, St. Josef-Hospital Bochum, Gudrunstraße 56, Bochum 44791, Germany
2. Department of Neurology, Huntington Center North Rhine-Westphalia, Ruhr-University Bochum, St. Josef-Hospital Bochum, Bochum, Germany
3. Department of Neurology, Klinikum Dortmund, Dortmund, Germany