| R Arnold Substantia nigra MR imaging signal changes and cardiomyopathy following prenatal exposure to cocaine and heroinR Arnold Department of Diagnostic Radiology, Northeastern Ohio Universities College of Medicine Canton Affiliated Hospitals, Canton, Ohio 44710, USA AJNR Am J Neuroradiol 29:828-9. 2008 Factors influencing subspecialty choice among radiology residents: a case study of pediatric radiologyRyan W Arnold Department of Radiology, Aultman Hospital NEOUCOM Radiology Residency Program, Canton, Ohio, USA J Am Coll Radiol 6:635-42. 2009 Pulmonary CT angiography to evaluate for pulmonary embolism in children visiting adult-centered community hospitalsRyan W Arnold Department of Radiology, Children s Hospital Boston and Harvard Medical School, 300 Longwood Ave, Boston, MA 02115, USA AJR Am J Roentgenol 196:W823-30. 2011
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