1. From the Department of Neurology, Seoul National University College of Medicine, Korea (K.-W.N., T.J.K., H.-M.K., Y.-S.L., S.-B.K., B.-W.Y.)
2. Seoul National University Hospital, Korea (K.-W.N., T.J.K., S.-B.K., B.-W.Y.)
3. Clinical Research Center, Asan Medical Center, Seoul, Korea (J.S.L.)
4. Department of Neurology, Seoul Metropolitan Government-Seoul National University Boramae Medical Center, Korea (H.-M.K., Y.-S.L.).