No abstract available
Publication types
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Letter
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Research Support, U.S. Gov't, P.H.S.
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Comment
MeSH terms
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Air Pollutants, Occupational / adverse effects*
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Humans
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Male
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Metallurgy*
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Occupational Diseases / epidemiology*
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Pulmonary Disease, Chronic Obstructive / epidemiology*
Substances
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Air Pollutants, Occupational