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Contributors E-SS and BS wrote the manuscript and contributed equally to the critical revision and the final approval.
Funding The authors have not declared a specific grant for this research from any funding agency in the public, commercial or not-for-profit sectors.
Competing interests E-SS reports receiving an unrestricted educational grant from Philips Research to develop a physiological biomarker in COPD. BS reports no competing interests.
Patient consent for publication Not required.
Provenance and peer review Commissioned; externally peer reviewed.
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