1. Department of Diagnostic Radiology, Pusan National University Yangsan Hospital, Pusan National University School of Medicine, Busan, Korea.
2. Department of Diagnostic Radiology, Pusan National University Hospital, Pusan National University School of Medicine, Busan, Korea.
3. Department of Neurosurgery, Pusan National University Hospital, Pusan National University School of Medicine, Busan, Korea.
4. Department of Neurology, Pusan National University Yangsan Hospital, Pusan National University School of Medicine, Busan, Korea.