1. From the Department of Radiology, Thomas Jefferson University Hospitals, 132 S 10th St, 1079 Main Building, Philadelphia, PA 19107 (A.D.); Department of Medical Imaging, Nemours/Alfred I. duPont Hospital for Children, Wilmington, Del (V.K., D.S.); and Department of Radiology, Children’s Hospital of Philadelphia, Philadelphia, Pa (E.O.).