Biosocial aspects of multiple births.
D000293:Adolescent; D000328:Adult; D001827:Body Height; D002648:Child; D003431:Cross-Cultural Comparison; D005006:Ethnicity; D005260:Female; D005298:Fertility; D006801:Humans; D008423:Maternal Age; D009549:Nigeria; D010298:Parity; D011247:Pregnancy; D011272:Pregnancy, Multiple; D012923:Social Class; D014427:Twins