1. Department of Radiology, Dankook University Hospital, Cheonan, Korea.
2. Department of Radiology, Eunpyeong St. Mary’s Hospital, Seoul, Korea.
3. Department of Radiology, Ajou University Hospital, Suwon, Korea.
4. Department of Radiology, Inje University Haeundae Paik Hospital, Busan, Korea.
5. Department of Radiology, Severance Hospital, Seoul, Korea.
6. Department of Radiology, Hanyang University Hospital, Seoul, Korea.
7. Department of Radiology, Hanyang University Guri Hospital, Guri, Korea.
8. Department of Radiology, Seoul St. Mary’s Hospital, Seoul, Korea.
9. Department of Radiology, Kyung Hee University Hospital, Seoul, Korea.
10. Departmentof Radiology, Soonchunhyang University Bucheon Hospital, Bucheon, Korea.