1. Departments of Radiology and Center for Imaging Science Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea

2. Department of Radiology and Research Institute of Radiology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea

3. Department of Radiology, Institute of Radiation Medicine, and Cancer Research Institute, Seoul, Korea

4. Department of Radiation Oncology , Seoul National University College of Medicine, Seoul, Korea

5. Department of Pathology, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea