[1] Univ Ulsan, Coll Med, Dept Neurol, Gangneung Asan Hosp, Kangnung, South Korea
[2] Sungkyunkwan Univ, Sch Med, Samsung Med Ctr, Dept Neurol, Seoul, South Korea
[3] Korea Univ, Anam Hosp, Dept Neurol, Seoul, South Korea
[4] Chinese Univ Hong Kong, Fac Med, Dept Psychiat, Hong Kong, Peoples R China
[5] Univ Ulsan, Gangneung Asan Hosp, Coll Med, Dept Neurol, 38 Bangdong Gil, Kangnung 25440, South Korea