1. Department of Radiology and Center for Imaging Science, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul 06351, Korea.
2. Department of Radiology and Research Institute of Radiology, University of Ulsan College of Medicine, Asan Medical Center, Seoul 05505, Korea.
3. Department of Radiology, Ewha Womans University School of Medicine, Seoul 07985, Korea.
4. Department of Radiology, Ajou University School of Medicine, Suwon 16499, Korea.
5. Department of Radiology, Seoul National University College of Medicine, Seoul 03080, Korea.
6. Department of Radiology, Ansan Hospital, Korea University College of Medicine, Ansan 15355, Korea.
7. Department of Radiology, Soonchunhyang University Seoul Hospital, Seoul 04401, Korea.
8. Department of Radiology, Konkuk University Medical Center, Konkuk University School of Medicine, Seoul 05030, Korea.
9. Department of Radiology, Human Medical Imaging and Intervention Center, Seoul 06524, Korea.
10. Department of Radiology, Hanyang University College of Medicine, Hanyang University Hospital, Seoul 04763, Korea.
11. Department of Radiology, Kangbuk Samsung Hospital, Sungkyunkwan University School of Medicine, Seoul 03181, Korea.
12. Department of Radiology, Wonkwang University Hospital, Iksan 54538, Korea.
13. Department of Radiology, Seoul St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul 06591, Korea.
14. Department of Radiology, Busan Paik Hospital, Inje University College of Medicine, Busan 47392, Korea.
15. Department of Radiology, Severance Hospital, Research Institute of Radiological Science, Yonsei University College of Medicine, Seoul 03722, Korea.
16. Department of Radiology, Research Institute and Hospital, National Cancer Center, Goyang 10408, Korea.
17. Department of Radiology, Kyungpook National University Hospital, Daegu 41944, Korea.
18. Department of Radiology, Dong-A University Medical Center, Busan 49201, Korea.
19. Department of Radiology, Newwoori Namsan Hospital, Busan 46224, Korea.
20. Department of Radiology, SMG-SNU Boramae Medical Center, Seoul National University College of Medicine, Seoul 07061, Korea.
21. Department of Radiology and Thyroid Center, Daerim St. Mary's Hospital, Seoul 07442, Korea.