1. Department of Radiology, Pusan National University Hospital, Biomedical Research Institute, Busan, Korea.
2. Pusan National University School of Medicine, Yangsan, Korea.
3. Department of Neurosurgery, Pusan National University Hospital, Biomedical Research Institute, Busan, Korea.
4. Department of Pathology, Pusan National University Hospital, Biomedical Research Institute, Busan, Korea.