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Contributors PP conceived the study. RJ, HS and NP made substantial contribution to its design. RJ collected the data. All authors contributed to the analysis and interpretation of the data and critically revised drafts of the paper. They also read and approved the final version of the manuscript. PP is the guarantor.
Funding Funding for this study was received from the Gloucestershire Hospitals Chest Fund and the Gloucestershire Hospitals NHS Foundation Trust Research and Innovation Forum Fund.
Competing interests None declared.
Provenance and peer review Not commissioned; internally peer reviewed.