1. From the Department of Cardiovascular Sciences, University of Leicester and the NIHR Leicester Biomedical Research Centre, Glenfield Hospital, University Road, Leicester LE3 9QP, UK (G.S.G.); Joint Department of Medical Imaging, University Medical Imaging Toronto, University Health Network, Toronto, Canada (K.H.); and Department of Medical Imaging, University of Toronto, Toronto, Canada (K.H.).