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, Gyeonggi-do, Korea
3. Department of Radiology, Seoul National University Bundang Hospital, Gyeonggi-do, Korea
4. Program in Biomedical Radiation Sciences, Department of Transdisciplinary Studies, Graduate School of Convergence Science and Technology, Seoul National University, Seoul, Korea