The Publisher regrets that this article is an accidental duplication of an article that has already been published in Eur Respir J. 46 (2015) PA3852, http://dx.doi.org/10.1183/13993003.congress-2015.PA3852. The duplicate article has therefore been withdrawn. The full Elsevier Policy on Article Withdrawal can be found at https://www.elsevier.com/about/our-business/policies/article-withdrawal.
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