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特許 権利維持 Infertility is fundamentally the inability to conceive offspring. Infertility also refers to the state of a woman who is unable to carry a pregnancy to full term. There are many biological causes of infertility, including some that medical intervention can treat.[1] Infertility has increased by 4 percent since the 1980s, mostly from problems with fecundity due to an increase in age.
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