1. Department of Radiology, Research Institute of Radiological Science, Severance Hospital, Yonsei University College of Medicine, Seoul, Korea.
2. Department of Radiology, Korea University Guro Hospital, Korea University College of Medicine, Seoul, Korea.
3. Department of Radiology and Research Institute of Radiology, University of Ulsan College of Medicine, Asan Medical Center, Seoul, Korea.
4. Department of Radiology, Soonchunhyang University Bucheon Hospital, Bucheon, Korea.
5. Department of Radiology, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea.
6. Department of Internal Medicine, Severance Hospital, Yonsei University College of Medicine, Seoul, Korea.
7. Department of Internal Medicine, University of Ulsan College of Medicine, Asan Medical Center, Seoul, Korea.
8. Department of Internal Medicine, Soonchunhyang University Bucheon Hospital, Bucheon, Korea.
9. Department of Internal Medicine, Korea University Guro Hospital, Korea University College of Medicine, Seoul, Korea.
10. Department of Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea.