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Correspondence
Authors' response
  1. D C Cowan1,
  2. D R Taylor2
  1. 1University of Otago, Dunedin, New Zealand
  2. 2University of Otago Medical School, Department of Medicine, Dunedin School of Medicine, Dunedin, New Zealand
  1. Correspondence to D C Cowan, University of Otago, PO Box 913, Dunedin 9001, New Zealand; douglas.cowan{at}stonebow.otago.ac.nz

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We are grateful to Dr Martin et al for their comments, and accept that our study had certain design limitations. The data …

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Footnotes

  • Linked article 144592

  • Competing interests None.

  • Provenance and peer review Not commissioned; not externally peer reviewed.

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