title: Studies on spontaneous abortions.
mesh_terms: D000017:ABO Blood-Group System; D000022:Abortion, Spontaneous / Q000235:genetics*; D000328:Adult; D000782:Aneuploidy; D002869:Chromosome Aberrations / Q000175:diagnosis*; D025063:Chromosome Disorders; D005260:Female; D005333:Fetus; D005865:Gestational Age; D006801:Humans; D007621:Karyotyping; D008423:Maternal Age; D011247:Pregnancy; D014314:Trisomy
chemical_list: D000017:ABO Blood-Group System