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