title: Coal mining and COPD.
mesh_terms: D000328:Adult; D001991:Bronchitis / Q000503:physiopathology; D003032:Coal Mining; D005541:Forced Expiratory Volume / Q000502:physiology; D006801:Humans; D008173:Lung Diseases, Obstructive / Q000503:physiopathology*; D008297:Male; D008875:Middle Aged; D009784:Occupational Diseases / Q000209:etiology*; D012907:Smoking / Q000503:physiopathology