1. Department of Radiology, Chung-Ang University Hospital, Chung-Ang University College of Medicine, Seoul, Korea.
2. Department of Radiology, Hallym University Sacred Heart Hospital, Anyang, Korea.
3. Program in Biomedical Radiation Sciences, Department of Transdisciplinary Studies, Graduate School of Convergence Science and Technology, Seoul National University, Seoul, Korea.
4. Department of Radiology, Hanil General Hospital, Seoul, Korea.
5. Department of Radiology, Daejin Medical Center, Bundang Jesaeng General Hospital, Seongnam, Korea.
6. Department of Radiology, Seoul National University Bundang Hospital, Seongnam, Korea.