[1] Pusan Natl Univ, Pusan Natl Univ Hosp, Sch Med, Dept Neurol, Pusan 602739, South Korea
[2] Pusan Natl Univ, Pusan Natl Univ Hosp, Sch Med, Dept Radiol, Pusan 602739, South Korea
[3] Seoul Natl Univ, Dept Neurol, Coll Med, Bundang Hosp, Pusan, South Korea