title: Variations on a theme.
mesh_terms: D004624:Embryo Transfer / Q000379:methods*; D005260:Female; D005307:Fertilization in Vitro; D006801:Humans; D007247:Infertility, Female; D007248:Infertility, Male; D008297:Male; D033261:Maternal-Fetal Relations; D018587:Oocyte Donation; D011247:Pregnancy; D018570:Risk Assessment