1. Department of Radiology, Chung-Ang University College of Medicine, Chung-Ang University Hospital, Seoul, Korea.
2. Department of Radiology, University of Ulsan College of Medicine, Gangneung Asan Hospital, Gangneung, Korea.
3. Department of Radiology, Human Medical Imaging and Intervention Center, Seoul, Korea.
4. Department of Pathology, Ewha Clinical Laboratory, Seoul, Korea.