1. Department of Neurology, University Hospital Zurich, Frauenklinikstraße 26, 8091 Zurich, Switzerland
2. Department of Neurology, Kamillus-Klinik, Hospitalstrasse 6, 53567 Asbach, Germany
3. Department of Neurology, University of Bern, Inselspital, Freiburgstrasse 10, 3010 Bern, Switzerland