School years completed and 5-year changes in pulmonary function and respiratory symptoms in U.S. white male coal miners.
D000328:Adult; D000874:Anthracosilicosis / Q000209:etiology*; D003032:Coal Mining; D004522:Educational Status; D006801:Humans; D008297:Male; D012119:Respiration; D012907:Smoking; D014481:United States