1 Department of Otorhinolaryngology-Head and Neck Surgery, Korea University College of Medicine, Seoul, Republic of Korea.
2 Department of Neurology, Korea University College of Medicine, Korea University Medical Center, 73 Goryeodae-ro, Seongbuk-gu, Seoul, Republic of Korea. sulee716@gmail.com.
3 Department of Neurology, Seoul National University College of Medicine, Seoul, Republic of Korea. sulee716@gmail.com.
4 Department of Neurology, Seoul National University College of Medicine, Seoul, Republic of Korea.
5 Dizziness Center, Seoul National University Bundang Hospital, Seongnam, Republic of Korea.
6 Department of Neurology, Korea University College of Medicine, Korea University Medical Center, 73 Goryeodae-ro, Seongbuk-gu, Seoul, Republic of Korea.