[The decreasing incidence of multiple births].
D000328:Adult; D005260:Female; D006801:Humans; D008297:Male; D008423:Maternal Age; D008875:Middle Aged; D009426:Netherlands; D010298:Parity; D011247:Pregnancy; D014310:Triplets; D014427:Twins
Daling van het aantal meerlinggeboorten.