1. From the Division of Cardiology (P.G., L.G., R.Y., A.D.K., A.S., P.L-S., G.J.K., N.F., G.W., J.A.W.), Department of Medicine, Imaging Laboratories–Robarts Research Institute (J.S., L.P., M.D., J.A.W.), Lawson Health Research Institute (G.W., T.R.T., F.P., J.A.W.), Biomedical Imaging Research Centre (T.R.T., F.P., M.D., J.A.W.), and Department of Medical Biophysics (T.R.T., F.P., M.D.), University of Western Ontario, London, Ontario, Canada; Peking Union Medical College Hospital, Beijing, China (P.G.).