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Letter in response to Moradiya et al
  1. Waleed Brinjikji,
  2. Harry J Cloft
  1. Department of Radiology, Mayo Clinic, Rochester, Minnesota, USA
  1. Correspondence to Dr Waleed Brinjikji, Department of Radiology, Mayo Clinic, 200 1st St SW, Rochester, Minnesota 55901, USA; brinjikji.waleed{at}

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We acknowledge the error in omitting the newer ICD-9 procedure codes 3975 and 3976 for the years 2009 and 2010. Our mistake led to the omission of a substantial number …

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  • Competing interests None.

  • Provenance and peer review Not commissioned; internally peer reviewed.

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