title: The value of a stage prop: screening for chronic obstructive pulmonary disease.
mesh_terms: D003365:Costs and Cost Analysis; D005541:Forced Expiratory Volume; D006801:Humans; D008173:Lung Diseases, Obstructive / Q000517:prevention & control*; D008403:Mass Screening; D012907:Smoking; D013147:Spirometry