1. From the Samsung Biomedical Research Institute (C.-H.P.), Samsung Medical Center, Seoul, Korea; the Departments of Physical and Rehabilitation Medicine (W.H.C., Y.-H.K.), Diagnostic Radiology and Imaging Science (S.T.K.), and Neurology (O.Y.B.), Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea; the Department of Physical Medicine and Rehabilitation (S.H.O.), Hallym University College of Medicine, Seoul, Korea; and the Berenson-Allen Center for Noninvasive Brain...