1. Department of Radiology, Hanyang University Hospital, Hanyang University College of Medicine, Seoul, Korea.
2. Department of Radiology, Seoul St. Mary’s Hospital, College of Medicine, The Catholic University of Korea, Seoul, Korea.
3. Department of Biomedical Engineering, Hanyang University College of Medicine, Seoul, Korea.
4. Department of Neurology, Hanyang University Hospital, Hanyang University College of Medicine, Seoul, Korea.
5. Department of Nuclear Medicine, Hanyang University Guri Hospital, Hanyang University College of Medicine, Seoul, Korea.
6. Department of Nuclear Medicine, Hanyang University Hospital, Hanyang University College of Medicine, Seoul, Korea.