1. Department of Radiology and Research Institute of Radiology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Republic of Korea.
2. Department of Radiology, Seoul St. Mary’s Hospital, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea.
3. Department of Radiology, Seoul National University College of Medicine, Seoul, Republic of Korea.
4. Department of Radiology, Seoul National University Hospital, Seoul, Republic of Korea.