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. 2021 Aug 26;77(6):573–580. doi: 10.1136/thoraxjnl-2021-217160

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© Author(s) (or their employer(s)) 2022. Re-use permitted under CC BY-NC. No commercial re-use. See rights and permissions. Published by BMJ.

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Study population: 21 408 patients registered with COPD in the Danish Register of COPD (DrCOPD) from 1 January 2010 to 31 October 2017.