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