Department of Radiology, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Institute of Radiation Medicine, Seoul National University Medical Research Center, Gyeonggi-do, Republic of Korea. Department of Radiology and Research Institute of Radiological Science, Severance Hospital, Yonsei University College of Medicine, Seoul, Republic of Korea. Department of Radiology and Research Institute of Radiology, University of Ulsan College of Medicine, Asan Medical Center, Seoul, Republic of Korea. radiology97@amc.seoul.kr. Department of Radiology and Center for Imaging Science, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Republic of Korea. Department of Radiology and Institute of Radiation Medicine, Seoul National University Hospital, Seoul, Republic of Korea. Department of Radiology, Ajou University Hospital, Ajou University School of Medicine, Suwon, Republic of Korea. Yonsei Biomedical Research Institute, Department of Radiology, Research Institute of Radiological Science Yonsei University College of Medicine, Seoul, Republic of Korea. Department of Biostatistics, Yonsei University College of Medicine, Seoul, Republic of Korea. Department of Radiology and Research Institute of Radiology, University of Ulsan College of Medicine, Asan Medical Center, Seoul, Republic of Korea.