[Incidence of anencephaly in Vizcaya: apropos of 20 cases].
D000328:Adult; D000757:Anencephaly / Q000453:epidemiology*; D005260:Female; D006801:Humans; D008297:Male; D008423:Maternal Age; D010298:Parity; D011247:Pregnancy; D012189:Retrospective Studies; D012621:Seasons; D013030:Spain
Incidencia de la anencefalia en Vizcaya: A propósito de 20 casos.