1. Department of Radiology, Kyung Hee University College of Medicine, Kyung Hee University Hospital at Gangdong, Seoul, Korea.
2. Department of Pathology, Kyung Hee University College of Medicine, Kyung Hee University Hospital at Gangdong, Seoul, Korea.
3. Department of Radiology, Gil Medical Center, Gachon University College of Medicine, Incheon, Korea.
4. Department of Radiology and Center for Imaging Sciences, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea.