1. Department of Radiology, Research Institute of Radiological Science, Severance Hospital, Yonsei University College of Medicine, Seoul, Korea.
2. Division of Pediatric Cardiology, Severance Hospital, Department of Pediatrics, Yonsei University College of Medicine, Seoul, Korea.
3. Division of Cardiovascular Surgery, Severance Cardiovascular Hospital, Department of Thoracic and Cardiovascular Surgery, Yonsei University College of Medicine, Seoul, Korea.