1. From Department of Radiology and Research Institute of Radiology (D.H.Y., J-W.K., N.K., T.-H.L.), Division of Cardiology (J.-K.S.), Department of Convergence Medicine (N.K.), and Department of Cardiovascular Surgery (J.-W.L.), Cardiac Imaging Center, Asan Medical Center, University of Ulsan College of Medicine, Seoul, South Korea.