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Consistency of sputum eosinophilia in difficult-to-treat asthma: A 5-year follow-up study

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I.H.v.V. received an unrestricted educational grant from AstraZeneca.

Disclosure of potential conflict of interest: E. H. Bel received an unrestricted grant from GlaxoSmithKline, receives research support from Cambridge Antigen Technology, has provided legal consultation/expert witness testimony for PDL Biopharma and Schering-Plough, and is a member of the editorial board of the American Journal of Respiratory and Critical Care Medicine (AJRCCM) for the American Thoracic Society. The rest of the authors have declared that they have no conflict of interest.

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