1. Department of Radiology, Seoul National University Hospital, Seoul, Korea.
2. Department of Radiology, Seoul National University College of Medicine, Seoul, Korea.
3. Institute of Radiation Medicine, Seoul National University Medical Research Center, Seoul, Korea.
4. Department of Radiology, Chung-Ang University Hospital, Seoul, Korea.
5. Department of Radiology, National Cancer Center, Goyang, Korea.
6. Department of Clinical Science, MR, Philips Healthcare Korea, Seoul, Korea.
7. Philips Research Hamburg, Hamburg, Germany.