Frequency of exacerbations in patients with chronic obstructive pulmonary disease: an analysis of the SPIROMICS cohort.
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Han MK, et al. Among authors: martinez fj, martinez ch.
Lancet Respir Med. 2017 Aug;5(8):619-626. doi: 10.1016/S2213-2600(17)30207-2. Epub 2017 Jun 28.
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PMID: 28668356
Free PMC article.