1. Department of Radiology and Research Institute of Radiology, University of Ulsan College of Medicine, Asan Medical Center, Seoul 05505, Korea.
2. Department of Radiology, Ajou University School of Medicine, Suwon 16499, Korea.
3. Department of Radiology, Thyroid Center, Daerim St. Mary's Hospital, Seoul 07442, Korea.
4. Department of Radiology, Chung-Ang University College of Medicine, Seoul 06973, Korea.
5. Department of Endocrinology and Metabolism, University of Ulsan College of Medicine, Asan Medical Center, Seoul 05505, Korea.