Declining fertility: egg or uterus?
D000328:Adult; D000375:Aging / Q000502:physiology*; D004624:Embryo Transfer; D005260:Female; D005298:Fertility / Q000502:physiology*; D006801:Humans; D008423:Maternal Age; D009865:Oocytes / Q000502:physiology*; D011247:Pregnancy; D018566:Pregnancy, High-Risk; D014599:Uterus / Q000502:physiology*