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Response to commentary

  • Charlotte Q. Wu
    Correspondence
    Correspondence to: Charlotte Q. Wu, Johns Hopkins University School of Medicine, 1800 Orleans St, Baltimore, MD 21287, USA. Tel: 410-955-3534, fax: 410-614-8096.
    Affiliations
    Division of Pediatric Urology, Department of Urology, James Buchanan Brady Urological Institute, Johns Hopkins University School of Medicine, Baltimore, MD, USA
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  • Emily S. Blum
    Affiliations
    Division of Pediatric Urology, Children's Healthcare of Atlanta, Emory University School of Medicine, Atlanta, GA, USA
    Department of Urology, Emory University School of Medicine; Atlanta, GA, USA
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  • Dattatraya Patil
    Affiliations
    Department of Urology, Emory University School of Medicine; Atlanta, GA, USA
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  • Edwin A. Smith
    Affiliations
    Division of Pediatric Urology, Children's Healthcare of Atlanta, Emory University School of Medicine, Atlanta, GA, USA
    Department of Urology, Emory University School of Medicine; Atlanta, GA, USA
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      There are indeed numerous variables to take into consideration with performance and interpretation of a VCUG, especially with the diagnosis of posterior urethral valves. In the current study, the ratios were measured under specific filling and voiding circumstances to reduce the possibility of an erroneous calculation on account of these dynamic factors. We agree that such calculations leave room for variability and can be vulnerable to lack of precision. If the VCUG fails to demonstrate adequate conditions to properly assess the ratios, a fallacious ratio will result.
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