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From the Divisions of *Body Imaging and Neuroradiology, Department of Radiology, Children’s Hospital of Philadelphia, Philadelphia, PA. Disclosure: The authors declare no conflict of interest. Reprints: Avrum N. Pollock, MD, FRCPC, Division of Neuroradiology, Department of Radiology, Children’s Hospital of Philadelphia, Room 2115, Wood Bldg, 324 S, 34th St, Philadelphia, PA 19104 (e-mail: [email protected]).
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Back et al. (2013) studied this question.
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