1. From Department of Medicine, Division of Cardiology (P.T.) and Department of Medical Imaging (P.T., B.J.W.), Peter Munk Cardiac Center, University Health Network, University of Toronto, Toronto, Canada; Cardiovascular Imaging, Heart and Vascular Institute, Cleveland Clinic, OH (S.D.F.); and Menzies Research Institute, University of Tasmania, Tasmania, Australia (T.H.M.).