title: [Chronic obstructive pulmonary disease: severity, activity and biomarkers].
authors.forename: Yong-chang
authors.initials: YC
authors.lastname: Sun
authors.forename: Wan-zhen
authors.initials: WZ
authors.lastname: Yao
mesh_terms: D015415:Biomarkers; D006801:Humans; D029424:Pulmonary Disease, Chronic Obstructive / Q000473:pathology
chemical_list: D015415:Biomarkers