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Authors' response
  1. Correspondence to Dr James D Chalmers, Royal Infirmary of Edinburgh, Department of Respiratory Medicine, Royal Infirmary of Edinburgh, 51 Little France Crescent, Edinburgh EH16 4SA, UK; jamesdchalmers{at}
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Chalmers JD, Singanayagam A, Hill AT
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Publication history

  • Accepted November 24, 2010
  • First published December 21, 2010.
Online issue publication 
November 17, 2011

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