1. From the Department of Medical Imaging, Nemours Children’s Health System/Alfred I. duPont Hospital for Children, Wilmington, Del (M.C.); Department of Radiology, Thomas Jefferson University, Philadelphia, Pa (M.C.); and Department of Medical Imaging/Radiology, Nemours Children’s Health System/Nemours Children’s Hospital, University of Central Florida, 13535 Nemours Pkwy, Orlando, FL 32827 (M.E., T.C., A.B.M., C.M.J., D.J.P.).