[1] Korea Univ, Coll Med, Dept Neurol, Ansan Hosp, Ansan, South Korea
[2] Sungkyunkwan Univ, Sch Med, Kangbuk Samsung Hosp, Dept Neurol, Seoul, South Korea
[3] Dong A Univ, Coll Med, Dept Neurol, Busan, South Korea
[4] Korea Univ, Anam Hosp, Dept Neurol, Coll Med, Seoul, South Korea
[5] Chonnam Natl Univ, Hwasun Hosp, Dept Neurol, Gwangju, South Korea
[6] Konkuk Univ, Dept Neurol, Coll Med, Seoul, South Korea
[7] Hallym Univ, Coll Med, Dept Neurol, Seoul, South Korea
[8] Inje Univ, Coll Med, Haeundae Paik Hosp, Dept Neurol, Busan, South Korea
[9] Yonsei Univ, Dept Neurol, Coll Med, Seoul, South Korea
[10] Yonsei Univ, Coll Med, Dept Neurol, 50-1 Yonsei Ro, Seoul 03722, South Korea