1. Department of Diagnostic Radiology, College of Medicine, Ewha Womans University Hospital, Seoul, Korea.
2. NMR Laboratory, Asan Institute for Life Sciences, University of Ulsan College of Medicine, Seoul, Korea.
3. Department of Diagnostic Radiology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea.
4. Department of Neurosurgery, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea.