1. Department of Radiology and Research Institute of Radiology, University of Ulsan College of Medicine, Asan Medical Center, Seoul, Korea.
2. Biomedical Research Center, Asan Institute for Life Sciences, Asan Medical Center, Seoul, Korea.
3. Department of Radiology and Research Institute of Radiology, University of Ulsan College of Medicine, Seoul, Korea.
4. School of Computer Science and Engineering, Soongsil University, Seoul, Korea.
5. Department of Radiology, Kyung Hee University Hospital, Seoul, Korea.
6. Department of Radiology, Wonkwang University College of Medicine, Wonkwang University Hospital, Iksan, Korea.
7. Health Screening & Promotion Center, University of Ulsan College of Medicine, Asan Medical Center, Seoul, Korea.