[1] Seoul Natl Univ, Coll Med, Bundang Hosp, Dept Neurol, 82 Gumi Ro 173 Beon Gil, Seongnam 13620, South Korea
[2] Eulji Univ, Nowon Eulji Med Ctr, Dept Neurol, Sch Med, Seoul, South Korea
[3] Eulji Univ, Uijeongbu Eulji Med Ctr, Dept Neurol, Uijongbu, South Korea
[4] Seoul Med Ctr, Dept Neurol, Seoul, South Korea
[5] Inje Univ, Dept Neurol, Ilsan Paik Hosp, Goyang, South Korea
[6] Soonchunhyang Univ, Soonchunhyang Univ Hosp, Dept Neurol, Coll Med, Seoul, South Korea
[7] Asan Med Ctr, Clin Res Ctr, Asan Inst Life Sci, Seoul, South Korea
[8] Korea Univ, Dept Biostat, Coll Med, Seoul, South Korea
[9] Korea Univ, Guro Hosp, Dept Neurol, Seoul, South Korea