[1] Univ Manitoba, Div Pediat Cardiol, Dept Pediat & Child Hlth, Hlth Sci Ctr,Pediat Cardiol, Winnipeg, MB, Canada
[2] Dalhousie Univ, Sect Cardiac Surg, IWK Hlth Ctr, Childrens Heart Ctr Halifax, Halifax, NS, Canada
[3] St Boniface Gen Hosp, Dept Diagnost Imaging, Winnipeg, MB, Canada
[4] Univ Manitoba, Dept Radiol, Ultrasound, Winnipeg, MB, Canada
[5] Univ Manitoba, Manitoba Ctr Hlth Policy, Winnipeg, MB, Canada