1. Brain Tumor Institute Medical Science Research Center, College of Medicine, Dong-A University, Busan, Korea.
2. Department of Neurosurgery, College of Medicine, Dong-A University, Busan, Korea.
3. Department of Pathology, College of Medicine, Dong-A University, Busan, Korea.
4. Department of Radiology, College of Medicine, Dong-A University, Busan, Korea.