[1] Hallym Unvers, Dept Neurol, Chuncheon Si, Gangwon Do, South Korea
[2] Sungkyunkwan Univ, Sch Med, Kangbuk Samsung Med Ctr, Dept Neurol, Seoul, South Korea
[3] Gyeongsang Natl Univ Hosp, Dept Neurol, Jinju, South Korea
[4] Natl Police Hosp, Dept Neurol, Seoul, South Korea
[5] Eulji Univ, Sch Med, Dept Neurol, Seoul, South Korea
[6] Ewha Womans Univ, Sch Med, Dept Neurol, Seoul, South Korea
[7] Chungnam Natl Univ, Dept Neurol, Taejon, South Korea
[8] Chung Ang Univ, Coll Med, Chung Ang Univ Hosp, Dept Neurol, Seoul 156756, South Korea
[9] Hallym Univ, Coll Med, Dongtan Sacred Heart Hosp, Dept Neurol, Ahnyang, South Korea