1 Department of Medical Imaging, Toronto General Hospital, Peter Munk Cardiac Centre, University Health Network (UHN), University of Toronto, 585 University Ave, 1 PMB-298, Toronto, ON, Canada M5G 2N2.
2 Department of Medical Imaging, Women's College Hospital, University of Toronto, Toronto.
3 Division of Cardiology, Peter Munk Cardiac Centre, Toronto General Hospital, University Health Network (UHN), University of Toronto, Toronto.
4 Cardiovascular Division, Women's College Hospital, University of Toronto, Toronto.