1. Department of Radiology, Gachon University Gil Medical Center, Incheon 21565, Korea.
2. Department of Radiology, GangNeung Asan Hospital, University of Ulsan College of Medicine, Gangneung 25440, Korea.
3. Department of Radiology and Research Institute of Radiology, Asan Medical Center, University of Ulsan College of Medicine, Seoul 05505, Korea.
4. Department of Radiology, Thyroid Center, Daerim St. Mary's Hospital, Seoul 07442, Korea.
5. Department of Radiology, Seoul National University Hospital, Seoul National University College of Medicine, Seoul 03080, Korea.