1. Department of Radiology, Konkuk University Medical Center, Konkuk University School of Medicine, Seoul, Republic of Korea
2. Department of Radiology, Asan Medical Center, Seoul, Republic of Korea
3. Department of Radiology, Inje University Haeundae Paik Hospital, Busan, Republic of Korea
4. Department of Radiology, Yeungnam University Medical Center, Daegu, Republic of Korea
5. Department of Radiology, Dong-Eui Medical Center, Busan, Republic of Korea
6. Department of Radiology, Yonsei University College of Medicine, Seoul, Republic of Korea