No abstract available
Publication types
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Comment
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Research Support, Non-U.S. Gov't
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Research Support, U.S. Gov't, P.H.S.
MeSH terms
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Birth Certificates*
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Case-Control Studies*
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Child
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Control Groups*
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Epidemiologic Research Design*
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Humans
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Neoplasms / epidemiology
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Random Allocation
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Telephone
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United States / epidemiology