1. Department of Radiology, University of Ulsan College of Medicine, Seoul, Korea.
2. Research Institute of Radiology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea.
3. Department of Radiology, Thyroid Center, Daerim St. Mary's Hospital, Seoul, Korea.
4. Department of Internal Medicine, Thyroid Center, Daerim St. Mary's Hospital, Seoul, Korea.
5. Department of Radiology, Chung-Ang University College of Medicine, Seoul, Korea.
6. Department of Endocrinology and Metabolism, University of Ulsan College of Medicine, Seoul, Korea.