The statement of interest information for the above manuscript was incomplete as R. Diel was not listed amongst the authors with statements to declare. The declaration text should have read as follows: “Statements of interest for D. Goletti, G. Ferrara, B. Kampmann, M. Ruhwald, D. Wagner and R. Diel can be found at www.erj.ersjournals.com/site/misc/statements.xhtml”. The authors apologise for this error.
- ©ERS 2012