[1] Hallym Univ, Coll Med, Sacred Heart Hosp, Dept Neurol, Seoul, South Korea
[2] Pusan Natl Univ, Sch Med, Pusan, South Korea
[3] Hallym Univ, Coll Med, Dongtan Sacred Heart Hosp, Dept Neurol, Hwaseong, Kyonggi Do, South Korea
[4] Yonsei Univ, Gangnam Severance Hosp, Seoul, South Korea
[5] Seoul Natl Univ, Bundang Hosp, Dept Neurol, Clin Neurosci Ctr, Seongnam, Kyonggi Do, South Korea
[6] Soonchunhyang Univ, Coll Med, Cheonan Hosp, Dept Neurol, Cheonan, Chungchong Namd, South Korea