Declaration of interest
DD Sin has received honorarium for talks on chronic obstructive pulmonary disease from AstraZeneca, GlaxoSmithKline, and Boehringer Ingelheim. The authors have no other relevant affiliations or financial involvement with any organization or entity with a financial interest in or financial conflict with the subject matter or materials discussed in the manuscript apart from those disclosed.
Reviewer disclosures
Peer reviewers on this manuscript have no relevant financial or other relationships to disclose.