1. Department of Neurology, Donders Institute for Brain, Cognition and Behavior, Center for Neuroscience, Radboud University Nijmegen Medical Center, Nijmegen, The Netherlands;
2. Department of Otorhinolaryngology, University Hospital, Basel, Switzerland; and
3. Servei de Neurologia, Institut Clínic de Neurociències, Institut d'Investigacions Biomèdiques August Pi i Sunyer, Hospital Clínic de Barcelona, Barcelona, Catalonia, Spain