1. Department of Radiology and Center for Imaging Science, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea.
2. Department of Radiology and Medical Research Institute, Pusan National University Hospital, Pusan National University School of Medicine, Busan, Korea.
3. School of Electronic and Electrical Engineering, Sungkyunkwan University, Suwon, Korea.
4. Center for Neuroscience Imaging Research, Institute for Basic Science, Suwon, Korea.
5. Department of Radiology, Kangwon National University Hospital, Kangwon National University School of Medicine, Chuncheon, Korea.