1. Department of Radiology, Gachon University Gil Medical Center, Incheon, Korea.
2. Department of Radiology, Human Medical Imaging and Intervention Center, Seoul, Korea.
3. Department of Radiology and Research Institute of Radiology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea.
4. Department of Radiology, Thyroid Center, Daerim St. Mary's Hospital, Seoul, Korea.
5. Department of Radiology, Seoul National University Hospital, Seoul National University College of Medicine, Seoul, Korea.