Anencephalus in Canada 1943-1970.
D000757:Anencephaly / Q000453:epidemiology* / Q000401:mortality; D002170:Canada; D004777:Environment; D005260:Female; D005313:Fetal Death; D006801:Humans; D007231:Infant, Newborn; D008297:Male; D008423:Maternal Age; D009511:New England; D010298:Parity; D011247:Pregnancy; D012189:Retrospective Studies; D012737:Sex Factors; D016135:Spinal Dysraphism / Q000453:epidemiology