1. From Department of Neurology (W.-J.K., M.H.Y., S.-H.I., M.-K.H., H.-J.B.), Stroke Center, Seoul National University Bundang Hospital, Seongnam-si, Korea; Department of Neurology (Y.K.), Chungbuk National University College of Medicine, Seoul, Korea; Department of Neurology (J.H.P.), Dongguk University Gyeongju Hospital, Seoul, Korea; Department of Biostatistics (J.S.L., J.L.), Korea University College of Medicine, Seoul, Korea.