[1] Catholic Univ Korea, St Vincents Hosp, Dept Neurol, Coll Med, Seoul, South Korea
[2] Kosin Univ, Coll Med, Dept Neurol, Gospel Hosp, Busan, South Korea
[3] Konkuk Univ, Dept Neurol, Sch Med, Seoul, South Korea
[4] Dongguk Univ, Dept Neurol, Ilsan Hosp, Goyang, South Korea
[5] Sungkyunkwan Univ, Dept Neurol, Samsung Med Ctr, Sch Med, Seoul, South Korea
[6] Eisai Korea Inc, Seoul, South Korea