From the Department of Radiology (J.H., Y.J.K., H.-J.L., J.E.N., H.S.K., Y.J.H., H.Y.K., K.O.C., B.W.C.), Department of Cardiovascular Radiology, Research Institute of Radiological Science, Yonsei University College of Medicine, Seoul, South Korea; the Division of Cardiology (J.-W.H., H.-J.C.), Yonsei Cardiovascular Center, Yonsei University College of Medicine, Seoul, South Korea; and the Department of Neurology (J.H.H.), Severance Hospital, Yonsei University College of Medicine, Seoul, South Korea. (At 2011-09)
