Environmental influences on twins apparent at birth. A preliminary study.
D001724:Birth Weight; D000013:Congenital Abnormalities / Q000453:epidemiology / Q000209:etiology; D005314:Embryonic and Fetal Development; D005321:Extraembryonic Membranes; D005260:Female; D005313:Fetal Death; D005826:Genetics, Medical; D005865:Gestational Age; D006801:Humans; D007231:Infant, Newborn; D008297:Male; D008431:Maternal-Fetal Exchange; D009929:Organ Size; D010298:Parity; D011247:Pregnancy; D011272:Pregnancy, Multiple; D014427:Twins