1. Department of Radiology and Research Institute of Radiology, University of Ulsan College of Medicine, Asan Medical Center, Seoul, Korea.
2. Department of Surgery, University of Ulsan College of Medicine, Asan Medical Center, Seoul, Korea.
3. Department of Pathology, University of Ulsan College of Medicine, Asan Medical Center, Seoul, Korea.
4. Department of Internal Medicine, University of Ulsan College of Medicine, Asan Medical Center, Seoul, Korea.