title: Chronic bronchitis and exposure to cereal grain dust.
mesh_terms: D000402:Airway Obstruction / Q000209:etiology; D000485:Allergens; D001249:Asthma / Q000209:etiology; D001991:Bronchitis / Q000276:immunology*; D002908:Chronic Disease; D004391:Dust; D002523:Edible Grain; D006801:Humans; D009784:Occupational Diseases; D012907:Smoking
chemical_list: D000485:Allergens; D004391:Dust