1. From the Department of Neurology (S.-H.K., S.-U.L., B.-H.C., K.-H.C., S.Y., B.-J.K.), Korea University Medical Center, Seoul; BK21 FOUR Program in Learning Health Systems (B.-J.K.), Korea University, Seoul; Dizziness Center (J.-S.K.), Clinical Neuroscience Center, Seoul National University Bundang Hospital, Seongnam; and Department of Neurology (J.-S.K.), Seoul National University College of Medicine, South Korea.