Institution: | aDepartment of Diagnostic Radiology, Research Institute of Radiological Science, Seoul, Republic of Korea;bDepartment of Diagnostic Radiology, Research Institute of Radiological Science and, Yonsei University College of Medicine, Seoul, Republic of Korea; Institute of Gastroenterology, Severance Hospital, Seoul, Republic of Korea;cDepartment of Pathology, Yonsei University College of Medicine, Seoul, Republic of Korea |