1Department of Radiology, Seoul National University Hospital, Seoul National College of Medicine, Seoul, Korea.
2Department of Radiology, Kangbuk Samsung Hospital, Sungkyunkwan University, School of Medicine, Seoul, Korea.
3Department of Radiology, Soonchunhyang University Seoul Hospital, Soonchunhyang University College of Medicine, Seoul, Korea.
4Department of Radiology, Research Institute of Clinical Medicine of Jeonbuk National University-Biomedical Research Institute of Jeonbuk National University Hospital, Jeonju, Korea.
5Department of Radiology, Dankook University Hospital, Cheonan, Korea.
6Department of Radiology, Chungbuk National University Hospital, Cheongju, Korea.
7Department of Radiology, Kangwon National University Hospital, Kangwon National University School of Medicine, Chuncheon, Korea.
8Department of Radiology, Keimyung University Dongsan Hospital, Keimyung University School of Medicine, Daegu, Korea.
9Department of Radiology, Chungnam National University Hospital, College of Medicine, Daejeon, Korea.
10Department of Radiology, Daegu Fatima Hospital, Daegu, Korea.
11Department of Radiology, Seoul St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Korea.
12Department of Radiology, Kyungpook National University Hospital, School of Medicine, Kyungpook National University, Daegu, Korea.
13Department of Radiology, Chonnam National University Hospital, Gwangju, Korea.
14Department of Radiology, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea.
15Department of Radiology, Seoul Medical Center, Seoul, Korea.
16Department of Radiology, Yeungnam University Hospital, Yeungnam University College of Medicine, Daegu, Korea.
17Department of Radiology, Busan Medical Center, Busan, Korea.
18Department of Radiology and Research Institute of Radiology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea.
19Department of Radiology, Ewha Womans University Seoul Hospital, Seoul, Korea.
20Department of Radiology, Pusan National University Hospital, Pusan National University School of Medicine and Biomedical Research Institute, Busan, Korea.