1. Division of Cardiology, Yonsei University Wonju College of Medicine, Wonju, Korea.
2. Department of Radiology, Yonsei University Wonju College of Medicine, Wonju, Korea.
3. Department of Cardiology, Gachon Medical School, Gil Medical Center, Incheon, Korea.
4. Division of Cardiology, Department of Internal Medicine, Inha University Hospital, Incheon, Korea.
5. Yonsei Cardiovascular Center and Cardiovascular Research Institute, Yonsei University College of Medicine, Seoul, Korea.
6. Division of Cardiology, Department of Medicine, St. Luke's Roosevelt Hospital, Columbia University College of Physicians and Surgeons, New York, NY, USA.