Smoking status and second-hand smoke biomarkers in COPD, asthma and healthy controls.

ERJ Open Res · 2020 · PMC7369429 · PMID 32714953

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an increasing trendno p-value reported

[ 13 ] showed an increasing trend of creatinine-normalised urinary cotinine values among asthmatic patients with the same smoking status according to the worsening of disease severity.

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