1. Department of Radiology, Ajou University School of Medicine, Suwon, Korea.
2. Department of Radiology, Human Medical Imaging and Intervention Center, Seoul, Korea.
3. Department of Radiology, GangNeung Asan Hospital, Gangwon-do, Korea.
4. Department of Radiology, Konkuk University Medical Center, Konkuk University School of Medicine, Seoul, Korea.
5. Department of Radiology, Ansan Hospital, Korea University School of Medicine, Gyeonggi-do, Korea.