1. Department of Neurology Chungbuk National University Hospital Cheongju South Korea
2. Department of Medical Sciences, Neurology Graduate School of Ajou University Suwon South Korea
3. Research Administration Team Seoul National University Bundang Hospital Seongnam South Korea
4. Dizziness Center, Clinical Neuroscience Center, Department of Neurology Seoul National University Bundang Hospital Seongnam South Korea
5. Department of Neurology Seoul National University College of Medicine Seoul South Korea
6. Department of Ophthalmology, Seoul National University Bundang Hospital Seoul National University College of Medicine Seongnam South Korea