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. Center for Liver and Pancreatobiliary Cancer and Department of Radiology, National Cancer Center, Goyang, Korea.
5. Department of Radiology and Research Institute of Radiology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea.
6. Department of Radiology and Research Institute of Radiological Science, Severance Hospital, Yonsei University College of Medicine, Seoul, Korea.