[1] Seoul Natl Univ, Coll Med, Dept Neurosurg, Seoul 110744, South Korea
[2] Seoul Natl Univ, Coll Med, Dept Neurol, Seoul 110744, South Korea
[3] Good Morning Hosp, Dept Neurosurg, Pyeongtaek, South Korea
[4] Soonchunhyang Univ, Dept Neurosurg, Sch Med, Seoul, South Korea
[5] Bundang Jesaeng Gen Hosp, Dept Neurosurg, Songnam, South Korea
[6] Inha Univ, Dept Neurosurg, Coll Med, Inchon, South Korea
[7] Inha Univ, Dept Neurol, Coll Med, Inchon, South Korea
[8] Wonkwang Univ, Sch Med, Dept Neurosurg, Iksan, South Korea
[9] Hanyang Univ, Coll Med, Dept Neurosurg, Guri, South Korea
[10] Inje Univ, Coll Med, Dept Neurol, Goyang, South Korea
[11] Hallym Univ, Coll Med, Dept Neurol, Anyang, South Korea
[12] Yonsei Univ, Coll Med, Dept Neurol, Seoul, South Korea
[13] Univ Ulsan, Coll Med, Dept Neurol, Seoul, South Korea
[14] Gyeongsang Natl Univ, Sch Med, Dept Neurosurg, Inchon, South Korea