1. From the Division of Cardiology, Severance Cardiovascular Hospital (I.-C.K., G.-R.H., J.-W.H., C.Y.S.), Department of Cardiovascular Surgery, Severance Cardiovascular Hospital (S.H.L., S.L., B.-C.C.), and Department of Radiology, Research Institute of Radiological Science, Severance Hospital (S.C., Y.J.K.), Yonsei University College of Medicine; and Division of Cardiology, Department of Internal Medicine, Dongsan Medical Center, Keimyung University (I.-C.K.).