1. Division of Cardiology, Department of Internal Medicine; Yonsei University College of Medicine; Seoul Korea
2. Division of Cardiology, Department of Internal Medicine; Armed Forces Capital Hospital; Seongnam Korea
3. Department of Radiology, Research Institute of Radiological Science; Yonsei University Medical College; Seoul Korea
4. Division of Cardiology, Department of Internal Medicine; Bundang CHA Medical Center, CHA University; Seongnam Korea