1. Biomedical Research Institute, Seoul National University Bundang Hospital, Seongnam, Korea.
2. Department of Health Science and Technology, Graduate School of Convergence Science and Technology, Seoul National University, Seoul, Korea.
3. Department of Neurology, Seoul National University College of Medicine, Seoul, Korea.
4. Department of Neurology, Dizziness Center, Clinical Neuroscience Center, Seoul National University Bundang Hospital, Seongnam, Korea.