title: A 21-year radiographic follow-up of workers in the diatomite industry.
mesh_terms: D000328:Adult; D000397:Air Pollution / Q000517:prevention & control; D004781:Environmental Exposure; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D009787:Occupational Medicine; D011009:Pneumoconiosis / Q000000981:diagnostic imaging / Q000209:etiology*; D011859:Radiography; D012822:Silicon Dioxide / Q000633:toxicity*
chemical_list: D012822:Silicon Dioxide