1. Division of Cardiology (T.R.W., Y.W., M.D.Q., L.S.R., M.A.J.), Children’s Hospital of Philadelphia, PA.
2. Department of Anesthesiology and Critical Care Medicine (A.R.C., M.A.J.), Children’s Hospital of Philadelphia, PA.
3. Laboratory for Percutaneous Surgery, Queens University, Kingston, Ontario, Canada (A.L.).
4. Pixel Medical, Kingston, Ontario, Canada (C.P.).
5. Departments of Radiology and Bioengineering, University of Pennsylvania, Philadelphia (A.M.P.).
6. Department of Radiology (D.M.B.), Children’s Hospital of Philadelphia, PA.
7. Division of Pediatric Cardiac Surgery (M.N., J.M.C.), Children’s Hospital of Philadelphia, PA.