[1] Univ Ulsan, Dept Neurol, Asan Med Ctr, Coll Med, 388-1 Pungnap 2 Dong, Seoul 138736, South Korea
[2] Univ Ulsan, Dept Neurol, Gangneung Asan Hosp, Coll Med, Kangnung, South Korea
[3] Chosun Univ, Dept Pediat, Sch Med, Kwangju, South Korea
[4] Hallym Univ, Dept Neurol, Coll Med, Seoul, South Korea
[5] Gachon Univ, Dept Neurol, Coll Med, Inchon, South Korea
[6] Dankook Univ, Dept Neurol, Coll Med, Cheonan, South Korea
[7] Kyungpook Natl Univ, Dept Neurol, Coll Med, Taegu, South Korea
[8] Pusan Natl Univ, Dept Neurol, Coll Med, Pusan, South Korea