1. From the Department of Neurology, Seoul National University Bundang Hospital, Seongnam, Korea (Y.H.P., B.J.K., M.H.Y., M.S.J., M.-K.H., S.Y.K., H.-J.B.); Department of Neurology, Seoul National University College of Medicine, Korea (Y.H.P., B.J.K., J.-S.K., M.-K.H., S.Y.K., H.-J.B.); Department of Neurology, Dong-A University Medical Center, Busan, Korea (N.K.); Biostatistical Consulting Unit, Soonchunhyang University Medical Center, Seoul, Korea (J.S.L.); and Department of Biostatistics, College of...