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Authors’ response to Walker et al.


  1. Correspondence to Dr Norbert Metzdorf, TA Respiratory Diseases, Boehringer Ingelheim Pharma GmbH & Co. KG, Binger Strasse 173, D-55216 Ingelheim am Rhein, Germany; norbert.metzdorf{at}
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Tashkin DP, Metzdorf N, Hallmann C, et al
Authors’ response to Walker et al.

Publication history

  • Received August 30, 2013
  • Accepted September 26, 2013
  • First published October 14, 2013.
Online issue publication 
September 01, 2022

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