1. Department of Neurosurgery, Yonsei University Wonju College of Medicine, Korea.
2. Department of Radiology, Yonsei University Wonju College of Medicine, Wonju, Korea.
3. Department of Neurology, Yonsei University Wonju College of Medicine, Wonju, Korea.
4. Department of Pathology, Yonsei University Wonju College of Medicine, Wonju, Korea.