[1] Dongguk Univ, Coll Med, Dept Neurol, Gyeongju Hosp, Gyeongju, South Korea
[2] Univ Ulsan, Ulsan Univ Hosp, Dept Neurol, Coll Med, Ulsan, South Korea
[3] Daegu Fatima Hosp, Dept Rehabil, Daegu, South Korea
[4] Kyungpook Natl Univ, Chilgok Hosp, Sch Med, Dept Neurol, 807 Hoguk Ro, Daegu 41944, South Korea