1 Department of Neurology, Huntington-Centre NRW, St. Josef Hospital, Ruhr-University of Bochum, Gudrunstraße 56, 44791 Bochum, Germany. Electronic address: carsten.saft@ruhr-uni-bochum.de.
2 Department of Neurology, Huntington-Centre NRW, St. Josef Hospital, Ruhr-University of Bochum, Gudrunstraße 56, 44791 Bochum, Germany.
3 Department of Human Genetics, Ruhr-University of Bochum, Bochum, Germany.
4 Department of Neurology, Medical University of Innsbruck, Innsbruck, Austria.