title: Chronic bronchitis in ex-coal miners working in the steel industry.
mesh_terms: D000328:Adult; D000367:Age Factors; D000497:Alloys; D001991:Bronchitis / Q000453:epidemiology*; D002908:Chronic Disease; D003032:Coal Mining; D006801:Humans; D007501:Iron; D008297:Male; D008669:Metallurgy; D008875:Middle Aged; D009784:Occupational Diseases / Q000453:epidemiology*; D012907:Smoking; D013147:Spirometry; D014852:Wales
chemical_list: D000497:Alloys; D007501:Iron