1. Department of Radiology and Research Institute of Radiology, Cardiac Imaging Center, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea.
2. Department of Radiology, Kyung Hee University Hospital at Gangdong, Seoul, Korea.
3. Department of Cardiology, University Medical Center, Ho Chi Minh, Vietnam.
4. Division of Cardiology, Department of Internal Medicine, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea.
5. Department of Cardiothoracic Surgery, Asan Medical Center, Seoul, Korea.