1. Department of Radiology, Dongnam Institute of Radiological and Medical Science, Busan, Korea.
2. Department of Radiology, Dong-A University College of Medicine, Dong-A University Hospital, Busan, Korea.
3. Department of Radiology, Isam Hospital, Busan, Korea.
4. Department of Radiology, Pusan National University Yangsan Hospital, Yangsan, Korea.