1 Department of Diagnostic Imaging, Rhode Island Hospital-Hasbro Children's Hospital, Warren Alpert Medical School of Brown University, Providence, Rhode Island. Electronic address: rayyala@gmail.com.
2 Department of Radiology, Columbia University Medical Center, New York, New York.
3 Department of Radiology, Columbia University Medical Center, Morgan Stanley Children's Hospital, New York, New York.
4 Department of Radiology, Boston Children's Hospital, Harvard Medical School, Boston, Massachusetts.