[1] Seoul Natl Univ Hosp, Dept Neurol, Seoul 110744, South Korea
[2] Seoul Natl Univ Hosp, Movement Disorder Ctr, CRC, Seoul 110744, South Korea
[3] Inje Univ, Ilsan Paik Hosp, Dept Neurol, Goyang, South Korea
[4] Inje Univ, Ilsan Paik Hosp, Clin Res Ctr, Goyang, South Korea