[1] Sungkyunkwan Univ, Sch Med, Samsung Med Ctr, Dept Neurol, Seoul, South Korea
[2] Seoul Natl Univ, Coll Med, Seoul Natl Univ Hosp, Dept Neurol, Seoul, South Korea
[3] Catholic Univ Korea, Seoul St Marys Hosp, Catholic Hematol Hosp, Dept Hematol, Seoul, South Korea
[4] Catholic Univ Korea, Coll Med, Leukemia Res Inst, Seoul, South Korea