[1] Hallym Univ, Kangnam Sacred Heart Hosp, Dept Neurol, Coll Med, Chunchon, South Korea
[2] Seoul Natl Univ Hosp, Dept Neurol, Seoul, South Korea
[3] Kyung Hee Univ Hosp Gangdong, Dept Neurol, Seoul, South Korea
[4] Soonchunhyang Univ, Cheonan Hosp, Dept Neurol, Coll Med, Cheonan, South Korea
[5] Ajou Univ Hosp, Dept Neurol, Suwon, South Korea
[6] Dept Neurosurg, Suwon, South Korea
[7] Seoul Natl Univ Hosp, Seoul, South Korea