1. Department of Radiology, Human Medical Imaging & Intervention Center, Seoul 137-902, Korea.
2. Department of Radiology and Research Institute of Radiology, University of Ulsan College of Medicine, Asan Medical Center, Seoul 138-736, Korea.
3. Department of Radiology, Seoul St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul 137-701, Korea.
4. Department of Radiology, Seoul National University College of Medicine, Seoul 110-744, Korea.
5. Department of Radiology and Thyroid Center, Daerim St. Mary's Hospital, Seoul 150-070, Korea.
6. Department of Radiology and Center for Imaging Science, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul 135-710, Korea.
7. Department of Radiology, Yonsei Univsersity College of Medicine, Seoul 120-752, Korea.
8. Department of Radiology, Dong-A University Medical Center, Busan 602-713, Korea.
9. Department of Radiology, Busan Paik Hospital, Inje University College of Medicine, Busan 633-165, Korea.
10. Department of Radiology, Hanyang University College of Medicine, Hanyang University Hospital, Seoul 133-792, Korea.
11. Department of Radiology, Haeundae Healings Hospital, Busan 613-101, Korea.
12. Department of Radiology, Ansan Hospital, Korea University Medical College, Ansan 425-707, Korea.
13. Department of Radiology and Thyroid Center, Chung-Ang University Hospital, Chung-Ang University College of Medicine, Seoul 156-755, Korea.
14. Department of Radiology, Mothers' Clinic, Seongnam 463-821, Korea.
15. Department of Radiology, CHA University College of Medicine, Gangnam CHA Hospital, Seoul 135-081, Korea.
16. Department of Radiology, Ajou University School of Medicine, Suwon 443-721, Korea.
17. Department of Radiology, UNMEC Clinic, Daegu 704-910, Korea.
18. Department of Radiology, Dr. Han's Breast Clinic, Seoul 135-892, Korea.
19. Department of Radiology, Myung Jindan Health Care Center, Seoul 157-927, Korea.
20. Department of Radiology, Thyroid Clinic, Philip Medical Center, Seoul 150-042, Korea.