[1] Seoul Natl Univ, Dept Neurol, Coll Med, Seoul 110744, South Korea
[2] Seoul Natl Univ, Coll Med, Dept Movement Disorder Ctr, Parkinson Study Grp, Seoul 110744, South Korea
[3] Seoul Natl Univ, Coll Med, Neurosci Res Inst, Seoul 110744, South Korea
[4] Seoul Natl Univ, Coll Med, Dept Biochem & Mol Biol, Seoul 110744, South Korea