[1] Sungkyunkwan Univ, Sch Med, Kangbuk Samsung Hosp, Dept Neurol, Seoul, South Korea
[2] Dong A Univ, Dept Neurol, Coll Med, Pusan, South Korea
[3] Konkuk Univ, Sch Med, Dept Neurol, Seoul, South Korea
[4] Chung Ang Univ, Coll Med, Dept Neurol, Med Ctr, Seoul 156756, South Korea
[5] Seoul Med Ctr, Dept Neurol, Seoul, South Korea
[6] Ajou Univ, Sch Med, Dept Neurol, Suwon 441749, South Korea
[7] Sungkyunkwan Univ, Sch Med, Samsung Med Ctr, Dept Neurol, Seoul, South Korea
[8] Korea Univ, Med Ctr, Dept Neurol, Seoul, South Korea
[9] Eulji Univ, Sch Med, Eulji Univ Hosp, Dept Neurol, Taejon 302799, South Korea