1. Division of Cardiology, Severance Cardiovascular Hospital, Yonsei University College of Medicine, Seoul, Korea.
2. Department of Thoracic and Cardiovascular Surgery, Severance Hospital, Yonsei University College of Medicine, Seoul, Korea.
3. Division of Pulmonology and Critical Care Medicine, Department of Internal Medicine, Severance Hospital, Yonsei University College of Medicine, Seoul, Korea.
4. Division of Pediatric Cardiology, Severance Cardiovascular Hospital, Yonsei University College of Medicine, Seoul, Korea.
5. Yongin Severance Hospital, Yonsei University College of Medicine, Yongin, Korea.