[1] Seoul Natl Univ Canc Hosp, Ctr Neurooncol, Seoul, South Korea
[2] Seoul Natl Univ Hosp, Dept Neurol, Seoul 110744, South Korea
[3] Seoul Natl Univ Hosp, Dept Neurosurg, Seoul 110744, South Korea
[4] Seoul Natl Univ Hosp, Dept Radiol, Seoul 110744, South Korea
[5] Seoul Natl Univ Hosp, Dept Internal Med, Div Med Oncol, Seoul 110744, South Korea
[6] Seoul Natl Univ Hosp, Dept Pathol, Seoul 110744, South Korea
[7] Seoul Natl Univ Hosp, Dept Radiat Oncol, Seoul 110744, South Korea