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The authors’ reply:
  1. Dr C P Gale, Division of Biostatistics, University of Leeds, Leeds LS2 9JT, UK; c.p.gale{at}
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Gale CP, Manda SOM, Cattle BA, et al
The authors’ reply:

Publication history

  • First published May 28, 2009.
Online issue publication 
May 28, 2009

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