1. Department of Thoracic and Cardiovascular Surgery, Asan Medical Center, University of Ulsan, Seoul, Korea.
2. Department of Thoracic and Cardiovascular Surgery, College of Medicine, Seoul National University, Seoul, Korea.
3. Division of Cardiology, Asan Medical Center, University of Ulsan, Seoul, Korea.
4. Department of Radiology, Asan Medical Center, University of Ulsan, Seoul, Korea.