[1] King Fahad Med City, Prince Sa lman Heart Ctr, Dept Cardiovasc Dis, Riyadh, Saudi Arabia
[2] Mayo Clin Arizona, Div Cardiovasc Dis, Scottsdale, AZ USA
[3] Univ Calgary, Alberta Childrens Hosp, Pediat Cardiol Sect, Calgary, AB, Canada
[4] Univ Calgary, Peter Lougheed Hosp, Div Cardiovasc Dis, Calgary, AB, Canada