No abstract available
MeSH terms
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Chromium / blood*
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Environmental Pollutants / blood*
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Female
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Head and Neck Neoplasms / epidemiology*
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Humans
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Male
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Nickel / blood*
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Occupational Exposure / statistics & numerical data*
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Smoking / epidemiology*
Substances
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Environmental Pollutants
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Chromium
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Nickel