[1] Sungkyunkwan Univ, Sch Med, Samsung Med Ctr, Dept Neurol, Seoul, South Korea
[2] Chonnam Natl Univ, Sch Med, Dept Neurol, Kwangju, South Korea
[3] Chung Ang Univ, Coll Med, Dept Neurol, Seoul 156756, South Korea
[4] Eulji Univ, Sch Med, Eulji Hosp, Dept Neurol, Seoul, South Korea
[5] Uijongbu Med Ctr, Dept Neurol, Uijongbu, South Korea
[6] Youngnam Univ, Coll Med, Dept Neurol, Taegu, South Korea
[7] Seoul Med Ctr, Dept Neurol, Seoul, South Korea
[8] Sungkyunkwan Univ, Sch Med, Samsung Med Ctr, Dept Ophthalmol, Seoul, South Korea