[1] Liverpool Heart & Chest Hosp, Adult Congenital Heart Dis Ctr, Liverpool L14 3PE, England
[2] Liverpool Heart & Chest Hosp, Radiol Dept, Liverpool L14 3PE, England
[3] Al Kasr Al Aini, Radiol Dept, Cairo 11562, Egypt
[4] Univ Zurich, Cardiol Dept, CH-8006 Zurich, Switzerland
[5] Natl Heart Inst, Cardiol Dept, Giza 11111, Egypt