1. Department of Radiology, Anam Hospital, Korea University College of Medicine, Seoul, Republic of Korea.
2. Department of Radiology, St. Vincent’s Hospital, The Catholic University of Korea, Suwon, Republic of Korea.
3. Department of Radiology, Seoul St. Mary’s Hospital, The Catholic University of Korea, Seoul, Republic of Korea.
4. Department of Radiology, Yeouido St. Mary’s Hospital, The Catholic University of Korea, Seoul, Republic of Korea.