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External validation of EULAR/ACR classification criteria for idiopathic inflammatory myopathies
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  1. Queenie Luu1,2,
  2. Jessica Day3,4,
  3. Alix Hall5,
  4. Vidya Limaye6,
  5. Gabor Major7,8
  1. 1Department of Rheumatology, Canterbury Hospital, Campsie, New South Wales, Australia
  2. 2South Western Sydney Clinical School, University of New South Wales, Liverpool, New South Wales, Australia
  3. 3Department of Rheumatology, Royal Adelaide Hospital, Adelaide, South Australia, Australia
  4. 4School of Pharmacy & Medical Sciences, University of South Australia, Adelaide, South Australia, Australia
  5. 5Hunter Medical Research Institute, The University of Newcastle, New Lambton, New South Wales, Australia
  6. 6Discipline of Medicine, The University of Adelaide, Adelaide, South Australia, Australia
  7. 7Department of Rheumatology, John Hunter Hospital, New Lambton Heights, New South Wales, Australia
  8. 8Faculty of Medicine, The University of Newcastle, Callaghan, New South Wales, Australia
  1. Correspondence to Dr Queenie Luu, Rheumatology, Canterbury Hospital, Campsie, NSW 2194, Australia; queenie.luu{at}gmail.com

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We have read with great interest the article published by Jinnin et al, which was an external validation of sensitivity and specificity of the EULAR/ACR (European League Against Rheumatism / American College of Rheumatology) classification criteria for idiopathic inflammatory myopathies with a Japanese cohort. The title and article claim that this is the first external validation study. While this may be true for a Japanese cohort, our intention is to alert the readers to the earlier published validation studies that preceded this and help highlight the complete body of evidence that should be considered.

The idiopathic inflammatory myopathies (IIMs) are a group of uncommon disorders with a potential for significant mortality and morbidity. Progress in the understanding and management of these disorders has been …

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