1. Department of Radiology, Busan Paik Hospital, Inje University College of Medicine, Busan, Korea.
2. Department of Radiology, Seoul St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Korea.
3. Department of Radiology and Research Institute of Radiology, University of Ulsan College of Medicine, Asan Medical Center, Seoul, Korea.
4. Department of Radiology, Severance Hospital, Yonsei University College of Medicine, Seoul, Korea.
5. Department of Radiology, Haeundae Paik Hospital, Inje University College of Medicine, Busan, Korea.
6. Department of Radiology, Human Medical Imaging & Intervention Center, Seoul, Korea.
7. Department of Radiology, Boramae Medical Center, Seoul National University College of Medicine, Seoul, Korea.
8. Department of Radiology, Seoul National University Hospital, Seoul National University College of Medicine, Seoul, Korea.
9. Department of Radiology, Thyroid Center, Daerim St. Mary's Hospital, Seoul, Korea.
10. Department of Radiology, Ansan Hospital, Korea University Medical College, Ansan, Korea.
11. Department of Radiology, Kangbuk Samsung Hospital, Sungkyunkwan University School of Medicine, Seoul, Korea.