[1] Univ Toronto, Richard Lewar Ctr Excellence, Toronto, ON, Canada
[2] Hosp Sick Children, Dept Cardiol, Toronto, ON, Canada
[3] Univ Toronto, Congenital Cardiac Ctr Adults, Toronto, ON, Canada
[4] Univ Toronto, Toronto Gen Hosp, Congenital Cardiac Ctr Adults, Univ Hlth Network,Dept Med Imaging, Toronto, ON M5G 2C4, Canada