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Subpopulations and intermediate outcome measures in COPD study
Association of sputum and blood eosinophil concentrations with clinical measures of COPD severity: an analysis of the SPIROMICS cohort.
-- Lancet Respir Med
The value of blood cytokines and chemokines in assessing COPD.
-- Respir Res
Variability in objective and subjective measures affects baseline values in studies of patients with COPD.
-- PLoS One