From the Centers for Disease Control and Prevention. Contribution of assisted reproduction technology and ovulation-inducing drugs to triplet and higher-order multiple births--United States, 1980-1997.
D000328:Adult; D005260:Female; D006801:Humans; D008423:Maternal Age; D008875:Middle Aged; D009099:Multiple Birth Offspring / Q000706:statistics & numerical data*; D010062:Ovulation Induction; D012099:Reproductive Techniques; D014310:Triplets / Q000706:statistics & numerical data; D014481:United States / Q000453:epidemiology