Rigden, Helen M Squamous Metaplasia Is Increased in the Bronchial Epithelium of Smokers with Chronic Obstructive Pulmonary Disease. [electronic resource] - PloS one 2016 - e0156009 p. digital Publication Type: Comparative Study; Journal Article ISSN: 1932-6203 Standard No.: 10.1371/journal.pone.0156009 doi Subjects--Topical Terms: Bronchi--drug effectsCase-Control StudiesEpithelial Cells--drug effectsFemaleHumansMaleMetaplasia--etiologyMiddle AgedPulmonary Disease, Chronic Obstructive--complicationsSmoking--adverse effects