Differences in the twinning trends between Finns and Swedes.
D000328:Adult; D005163:Factor Analysis, Statistical; D005260:Female; D005387:Finland; D006801:Humans; D008423:Maternal Age; D010298:Parity; D011247:Pregnancy; D011272:Pregnancy, Multiple; D013548:Sweden; D014427:Twins; D014507:Urbanization; D044465:White People