No abstract available
Publication types
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Clinical Trial
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Comparative Study
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Randomized Controlled Trial
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Research Support, U.S. Gov't, P.H.S.
MeSH terms
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Aged
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Case-Control Studies
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Double-Blind Method
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Finland
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Food, Fortified
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Humans
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Male
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Middle Aged
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Nails / chemistry*
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Nails / metabolism*
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Risk Factors
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Selenium / metabolism*
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Smoking / epidemiology
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Smoking / metabolism
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Statistics as Topic
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Time Factors
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Toes*
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Urinary Bladder Neoplasms / epidemiology*
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Urinary Bladder Neoplasms / metabolism*