rop-has-supplement yes pmc-prop-pdf-only no pmc-prop-suppress-copyright no pmc-prop-is-real-version no pmc-prop-is-scanned-article no pmc-prop-preprint no pmc-prop-in-epmc yes pmc-license-ref CC BY-NC-ND Introduction As fertility has fallen throughout the world, especially in high-income countries, a strong trend of increased postponement of childbearing has also been evident.
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Shifting the reproductive window: The contribution of ART and egg donation to fertility rates in the UK.
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