1. Department of Radiology, Daegu Fatima Hospital, Daegu 701-600, Korea.
2. Department of Radiology, Kyungpook National University, School of Medicine, Daegu 700-422, Korea.
3. Department of Internal Medicine, Daegu Fatima Hospital, Daegu 701-600, Korea.
4. Department of Radiology, Catholic University of Daegu, School of Medicine, Daegu 705-718, Korea.