title: Concordance and discordance of anencephaly in 109 twin pairs in Japan.
mesh_terms: D000757:Anencephaly / Q000453:epidemiology*; D004200:Diseases in Twins / Q000453:epidemiology*; D005260:Female; D006801:Humans; D007231:Infant, Newborn; D007564:Japan; D008297:Male; D011247:Pregnancy; D014427:Twins