1. Cardiology Division, Severance Cardiovascular Hospital, Yonsei University College of Medicine, Seoul, Korea.
2. Department of Radiology, Severance Cardiovascular Hospital, Yonsei University College of Medicine, Seoul, Korea.
3. Department of Pathology, Severance Cardiovascular Hospital, Yonsei University College of Medicine, Seoul, Korea.
4. Department of Cardiovascular Surgery, Severance Cardiovascular Hospital, Yonsei University College of Medicine, Seoul, Korea.