title: Chest symptomatology in an Egyptian portland cement factory.
mesh_terms: D000328:Adult; D001991:Bronchitis / Q000139:chemically induced*; D004391:Dust; D004534:Egypt; D006801:Humans; D008875:Middle Aged; D011009:Pneumoconiosis / Q000453:epidemiology / Q000209:etiology*; D012822:Silicon Dioxide; D012907:Smoking / Q000150:complications
chemical_list: D004391:Dust; D012822:Silicon Dioxide