No abstract available
MeSH terms
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Age Factors
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Cohort Studies
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Denmark
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Female
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Fertility / drug effects*
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Fertility Agents / administration & dosage
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Humans
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Infertility / drug therapy
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Pregnancy
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Pregnancy, Multiple / drug effects
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Pregnancy, Multiple / statistics & numerical data*
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Registries
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Reproductive Techniques, Assisted*
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Twins*