1. Department of Radiology, Kyung Hee University Hospital, College of Medicine, Kyung Hee University, Seoul 02447, Korea.
2. Department of Radiology, Kyung Hee University Hospital at Gangdong, College of Medicine, Kyung Hee University, Seoul 05278, Korea.
3. Department of Pathology, Kyung Hee University Hospital at Gangdong, College of Medicine, Kyung Hee University, Seoul 05278, Korea.