[1] Dong A Univ, Med Ctr, Dept Neurol, Pusan, South Korea
[2] Seoul Med Ctr, Dept Neurol, Seoul, South Korea
[3] Eulji Univ Hosp, Dept Neurol, Taejon, South Korea
[4] Soonchunhyang Univ Hosp, Dept Neurol, Asan Chungnam, South Korea
[5] Yeugnam Univ Hosp, Dept Neurol, Taegu, South Korea
[6] Dongguk Univ Hosp, Dept Neurol, Seoul, South Korea
[7] Ilsan Paik Hosp, Dept Neurol, Seoul, South Korea
[8] Chonnam Natl Univ Hosp, Dept Neurol, Kwangju, South Korea
[9] Hallym Univ, Dept Neurol, Sacred Heart Hosp, Chunchon, South Korea
[10] Eulji Gen Hosp, Dept Neurol, Taejon, South Korea
[11] Korea Univ, Coll Med, Dept Biostat, Seoul, South Korea
[12] Seoul Natl Univ, Dept Neurol, Bundang Hosp, Seoul 151, South Korea