1. Department of Radiology, Incheon St. Mary’s Hospital, College of Medicine, The Catholic University of Korea, Seoul, Korea.
2. Department of Radiology, Chung-Ang University Health Care System, Hyundae Hospital, Namyangju, Korea.
3. Department of Radiology and Research Institute of Radiology, University of Ulsan College of Medicine, Asan Medical Center, Seoul, Korea.
4. Institute of Biomedical Science, Catholic Kwandong University International St. Mary’s Hospital, Incheon, Korea.