1. Department of Radiology, Pusan National University Yangsan Hospital, Yangsan-si, Kyoungsangnam-do, South Korea
2. Department of Pathology, Pusan National University Yangsan Hospital, Yangsan-si, Kyoungsangnam-do, South Korea
3. Department of Neurosurgery, Pusan National University Yangsan Hospital, Yangsan-si, Kyoungsangnam-do, South Korea