1. Department of Radiology, College of Medicine, Ewha Womans University, Mokdong Hospital, Seoul 07985, Korea.
2. Department of Radiology and Research Institute of Radiology, University of Ulsan College of Medicine, Asan Medical Center, Seoul 05505, Korea.
3. Department of Pathology, University of Ulsan College of Medicine, Asan Medical Center, Seoul 05505, Korea.
4. Department of Radiology, University of Ulsan College of Medicine, Gangneung Asan Hospital, Gangneung 25440, Korea.