[1]Seoul Natl Univ Hosp, Dept Neurol, Seoul, South Korea.
[2]Seoul Natl Univ Hosp, Dept Pathol, Seoul, South Korea.
[3]Seoul Natl Univ Hosp, Dept Surg, Seoul, South Korea.
[4]Kyung Hee Univ Hosp, Dept Neurol, Seoul, South Korea.
[5]Ewha Womans Univ, Dept Neurol, Sch Med, Seoul, South Korea.
[6]Ewha Med Res Inst, Seoul, South Korea.
[7]Korea Adv Inst Sci & Technol, Grad Sch Med Sci & Engn, Daejeon, South Korea.
[8]Jilin Univ, China Japan Union Hosp, Dept Neurol, Changchun Shi, Peoples R China.