title: Analysis of multiple births in Japan. I. Weight at birth among 12,392 pairs of twins.
mesh_terms: D001724:Birth Weight; D005260:Female; D005313:Fetal Death; D006801:Humans; D007226:Infant Mortality; D007230:Infant, Low Birth Weight; D007231:Infant, Newborn; D007564:Japan; D008297:Male; D011247:Pregnancy; D012737:Sex Factors; D014427:Twins