1. Department of Otorhinolaryngology, Head and Neck Surgery, University Hospital Zurich, Zurich, Switzerland
2. Department of Neurology, University Hospital Zurich, Zurich, Switzerland
3. Department of Ophthalmology, University Hospital Zurich, Zurich, Switzerland
4. Woolcock Institute of Medical Research, Sydney, Australia
5. Neurology Department, Royal Prince Alfred Hospital, Camperdown, Sydney, Australia