1. Department of Radiology, Chonnam National University, School of Medicine, Chonnam National University Hospital, Gwangju 501-757, Korea.
2. Department of Radiology, Hwasun Chonnam National University Hospital, Gwangju 519-809, Korea.
3. Department of Surgery, Chonnam National University, School of Medicine, Chonnam National University Hospital, Gwangju 501-757, Korea.