[1] Seoul Natl Univ, Coll Med, Neurol, Seoul, South Korea
[2] John Radcliffe Hosp, Nuffield Dept Clin Neurosci, Oxfordshire City, England
[3] Korea Univ, Guro Hosp, Seoul, South Korea
[4] Seoul Natl Univ, Coll Med, Dept Ophthalmol, Seoul, South Korea
[5] Seoul Natl Univ, Bundang Hosp, Neurol, Seoung Nam City, South Korea