1. Department of Radiology, Chonnam National University Hospital, Gwangju, Korea.
2. Department of Radiology, Chonnam National University Hwasun Hospital, Hwasun, Korea.
3. Department of Radiology, Research Institute of Clinical Medicine of Jeonbuk National University-Biomedical Research Institute of Jeonbuk National University Hospital, Jeonju, Korea.
4. Department of Radiology and Biomedical Research Institute, Pusan National University Hospital, Busan, Korea.