title: Prevalence of respiratory symptoms among radiologically diagnosed chronic bronchitic and nonbronchitic quarrymen.
mesh_terms: D000328:Adult; D000393:Air Pollutants / Q000009:adverse effects*; D000395:Air Pollutants, Occupational / Q000009:adverse effects*; D001991:Bronchitis / Q000000981:diagnostic imaging* / Q000209:etiology; D002908:Chronic Disease; D004391:Dust; D006801:Humans; D008297:Male; D011859:Radiography; D012120:Respiration Disorders / Q000150:complications / Q000453:epidemiology*
chemical_list: D000393:Air Pollutants; D000395:Air Pollutants, Occupational; D004391:Dust