[1] Seoul Natl Univ, Coll Med, Dept Neurol, Seoul, South Korea
[2] Nuffield Dept Clin Neurosci, Neuroimmunol Grp, Oxford, England
[3] Seoul Natl Univ, Bundang Hosp, Dept Neurol, Gyeonggi, South Korea
[4] Seoul Med Ctr, Dept Neurol, Seoul, South Korea
[5] Joong Ang Univ, Dept Neurol, Coll Med, Seoul, South Korea
[6] Univ Ulsan, Coll Med, Dept Neurol, Asan Med Ctr, Ulsan, South Korea