Affiliation: | (1) Department of Neurosurgery, Seoul National University College of Medicine, Seoul National University, 110-744 Seoul, Korea;(2) Department of Internal Medicine, Seoul National University College of Medicine, Seoul National University, 110-744 Seoul, Korea;(3) Department of Radiation Oncology, Seoul National University College of Medicine, Seoul National University, 110-744 Seoul, Korea;(4) Seoul National University Hospital Cancer Research Institute, 110-744 Seoul, Korea |