title: [Sex ratio and maternal age in trisomy 18].
mesh_terms: D002902:Chromosomes, Human, 16-18; D005260:Female; D006801:Humans; D008297:Male; D008423:Maternal Age; D012744:Sex Ratio; D014314:Trisomy
vernacular_title: Sex-ratio et age maternel dans la trisomie 18