1. From the Department of Radiology (A.C.E., S.C.K., M.P.D., Y.S.) and Stead Family Department of Pediatrics (L.M.P.), University of Iowa Hospitals and Clinics, 200 Hawkins Dr, Iowa City, IA 52246; the University of Central Florida College of Medicine, Orlando, Fla (P.H.J.); and the Department of Radiology, Nemours Children’s Health System, Nemours Children’s Hospital, Orlando, Fla (M.E., C.M.J., D.J.P.).