1. Adult Congenital Heart Disease Centre, Liverpool Heart and Chest Hospital, Liverpool L14 3PE, UK
2. Radiology Department, Liverpool Heart and Chest Hospital, Liverpool L14 3PE, UK
3. Radiology Department, Al Kasr Al Aini, Old Cairo, Cairo 11562, Egypt
4. Cardiology Department, University of Zurich, 8006 Zurich, Switzerland
5. Cardiology Department, National Heart Institute, Giza 11111, Egypt