Causes of perinatal mortality in twins.
D000328:Adult; D005260:Female; D005313:Fetal Death / Q000209:etiology*; D006801:Humans; D007231:Infant, Newborn; D007234:Infant, Premature; D007746:Labor Presentation; D008297:Male; D010298:Parity; D011247:Pregnancy; D012737:Sex Factors; D014427:Twins