Affiliation: | a Department of Radiology, Research Institute of Radiological Science, Cardiovascular Center, Severance Hospital, Yonsei University College of Medicine, Seoul, Korea b Division of Cardiology, Cardiovascular Center, Severance Hospital, Yonsei University College of Medicine, Seoul, Korea c Department of Cardiovascular Surgery, Cardiovascular Center, Severance Hospital, Yonsei University College of Medicine, Seoul, Korea |