Understanding low COPD exacerbation rates in Japan: a review and comparison with other countries.

Int J Chron Obstruct Pulmon Dis · 2018 · PMC6208549 · PMID 30464435

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a decreasing trendno p-value reported

A decreasing trend in adult smoking rate might also affect the COPD exacerbation rate.

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Quoted from the open-access full text in Europe PMC under the licence the publisher applied. The sentence is reproduced exactly as published; the emphasis is ours.