1. From the Departments of Neurology (J.-W.C., M.J.L., G.-M.K., C.-S.C., O.Y.B.)
2. Hemato-oncology (M.-J.A.)
3. Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea; and Clinical Research Center, Samsung Biomedical Research Institute, Seoul, Korea (Y.H.C.).