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Authors' response
  1. J Nicholl,
  2. J West,
  3. S Goodacre,
  4. J Turner
  1. Medical Care Research Unit, University of Sheffield, Sheffield, UK
  1. Dr J Nicholl, Medical Care Research Unit, University of Sheffield, Regent Court, 30 Regent Street, Sheffield S1 4DA, UK; j.nicholl{at}

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Ashton and colleagues are of course right that it is time to hospital that is critical to outcome not distance, and that distance can be a poor proxy for time especially in urban areas. Nevertheless, for the purpose of research we would advocate using …

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