1. Department of Radiology, Thyroid Center, Daerim St. Mary's Hospital, Seoul, Korea.
2. Department of Radiology and Research Institute of Radiology, University of Ulsan College of Medicine, Asan Medical Center, Seoul, Korea.
3. Department of Radiology, Seoul St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Korea.
4. Department of Radiology, Seoul National University College of Medicine, Seoul, Korea.
5. Department of Internal Medicine, Thyroid Center, Daerim St. Mary's Hospital, Seoul, Korea.
6. Department of Endocrinology and Metabolism, University of Ulsan College of Medicine, Asan Medical Center, Seoul, Korea.
7. Department of Radiology, Human Medical Imaging & Intervention Center, Seoul, Korea.