title: How do multiple pregnancies reduce spontaneous in vivo?
mesh_terms: D000818:Animals; D004624:Embryo Transfer; D005260:Female; D005313:Fetal Death; D006801:Humans; D008954:Models, Biological; D011247:Pregnancy; D018607:Pregnancy Reduction, Multifetal; D011272:Pregnancy, Multiple; D012307:Risk Factors