1 Department of Neurology (Y-BP, S-HB, S-UL, SY), Korea University Medical Center, Seoul, Republic of Korea; Department of Neurology (S-UL, J-SK), Seoul National University College of Medicine, Seoul, Republic of Korea; Department of Neurology (SY), Korea University College of Medicine, Seoul, Republic of Korea; and Dizziness Center (J-SK), Seoul National University Bundang Hospital, Seongnam, Republic of Korea.