1 Division of Cardiology, Heart Institute, Children's Hospital Colorado, University of Colorado Denver Anschutz Medical Campus, Aurora, Colo. Electronic address: michal.schafer@cuanschutz.edu.
2 Division of Cardiology, Heart Institute, Children's Hospital Colorado, University of Colorado Denver Anschutz Medical Campus, Aurora, Colo.
3 Department of Radiology, Children's Hospital Colorado, University of Colorado Denver Anschutz Medical Campus, Aurora, Colo; Department of Bioengineering, College of Engineering and Applied Sciences, University of Colorado Denver Anschutz Medical Campus, Aurora, Colo.
4 Section of Congenital Heart Surgery, Heart Institute, Children's Hospital Colorado, University of Colorado Denver Anschutz Medical Campus, Aurora, Colo.