[1] Jeonbuk Natl Univ Hosp, Dept Neurol, Jeonju, South Korea
[2] Sch Med, Jeonju, South Korea
[3] Hallym Univ, Dongtan Sacred Heart Hosp, Coll Med, Dept Neurol, Hwaseong, South Korea
[4] Inje Univ, Ilsan Paik Hosp, Coll Med, Dept Neurol, Goyang, South Korea
[5] Sungkyunkwan Univ, Kangbuk Samsung Hosp, Coll Med, Dept Neurol, Seoul, South Korea
[6] Seoul Natl Univ, Seoul Natl Univ Hosp, Coll Med, Dept Neurol, Seoul, South Korea
[7] Yonsei Univ, Severance Hosp, Coll Med, Dept Neurol, Seoul, South Korea