1. Department of Radiology and the Research Institute of Radiology, University of Ulsan College of Medicine, Asan Medical Center, Seoul 05505, Korea.
2. Department of Radiology, Korea University Ansan Hospital, Korea University College of Medicine, Ansan 15355, Korea.
3. Department of Pathology, University of Ulsan College of Medicine, Asan Medical Center, Seoul 05505, Korea.
4. Department of Healthcare Management, Cheongju University, Cheongju 28503, Korea.