Statistics from Altmetric.com
Contributors FSG cowrote the article and helped with figure preparation. ES cowrote and finalised the article and completed the figure preparation.
Competing interests ESG reports grants from Medical Research Council, grants from British Lung Foundation, grants from NIHR, grants from Alpha 1 Foundation, grants from Wellcome Trust, outside the submitted work.
Provenance and peer review Commissioned; externally peer reviewed.
If you wish to reuse any or all of this article please use the link below which will take you to the Copyright Clearance Center’s RightsLink service. You will be able to get a quick price and instant permission to reuse the content in many different ways.