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