1 Department of Radiology, Research Institute for Convergence of Biomedical Science and Technology, Pusan National University Yangsan Hospital, Yangsan, Korea.
2 Department of Radiology, Pusan National University Hospital and Biomedical Research Institute, Pusan National University School of Medicine, Busan, Korea.
3 Department of Neurosurgery, Pusan National University Hospital and Biomedical Research Institute, Pusan National University School of Medicine, Busan, Korea.