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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Breast Neoplasms / epidemiology*
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Contraceptives, Oral / administration & dosage*
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Endometrial Neoplasms / epidemiology*
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Female
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Humans
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Ovarian Neoplasms / epidemiology*
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Uterine Cervical Neoplasms / epidemiology*