1. Department of Radiology, Kangwon National University Hospital, Chuncheon, Korea.
2. Department of Radiology and Research Institute of Radiology, University of Ulsan College of Medicine, Asan Medical Center, Seoul, Korea.
3. Department of Biomedical Research Institute, Kangwon National University Hospital, Chuncheon, Korea.
4. Department of Internal Medicine and Environmental Health Center, Kangwon National University Hospital, Chuncheon, Korea.
5. Department of Radiology and Center for Imaging Science, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea.
6. Department of Radiology, Veterans Health Service Medical Center, Seoul, Korea.
7. Department of Internal Medicine, School of Medicine, Kangwon National University, Chuncheon, Korea.