1. Department of Radiology, Seoul National University Bundang Hospital, Seongnam, Korea.
2. Department of Radiology, Seoul National University College of Medicine, Seoul, Korea.
3. Department of Radiology, Seoul Metropolitan Government-Seoul National University Boramae Medical Center, Seoul, Korea.
4. Department of Neurosurgery, Seoul Metropolitan Government-Seoul National University Boramae Medical Center, Seoul, Korea.
5. Department of Radiology, Seoul National University Hospital, Healthcare System Gangnam Center, Seoul, Korea.