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Maintaining quality of life in patients with chronic obstructive pulmonary disease (COPD) by extending the maintenance phase of community-based pulmonary rehabilitation: protocol for a randomised controlled trial (ComEx3 Study)

Crossref DOI link: https://doi.org/10.1136/bmjresp-2019-000548

Published Online: 2020-03-24

Published Print: 2020-03

Update policy: https://doi.org/10.1136/crossmarkpolicy

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