1. From the Division of Internal Medicine, Department of Medicine, London Health Sciences Centre, London, Ontario, Canada (F.A., M.Z., M.B., R.Y., N.M.F., J.A.W.); Department of Medicine, Stephenson Cardiovascular MR Centre at the Libin Cardiovascular Institute, University of Calgary, Calgary, Alberta, Canada (S.X.J., N.M.F., J.A.W.); and Imaging Research Laboratory, Robarts Research Institute (I.N., J.S.) and Lawson Health Research Institute (I.N.), Western University, London, Ontario, Canada.