[1] Goshin Univ Hosp, Pusan, South Korea
[2] Pyungchon Hanllym Univ Hosp, Pyungchon, South Korea
[3] Yongin Hyoja Med Ctr, Yongin, South Korea
[4] Ewha Womans Univ, Seoul, South Korea
[5] Dona Univ Hosp, Dept Neurol, Pusan, South Korea
[6] Dongsan Med Ctr, Taegu, South Korea