1. From the Cardiology Department (M.H., A.E., M.F.E.) and Radiology Department (A.K.), Cairo University, Egypt; Cardiology Department (M.H., K.W., P.P.S., A.E., H.M.), Radiology Department (A.K.), Biomedical Engineering Department (A.N.), and Cardiothoracic Department (M.H.Y.), Aswan Heart Centre, Egypt; and Imperial College, London, United Kingdom (M.H.Y.).