title: Maternal diagnostic x-irradiation before conception and the frequency of mongolism in children subsequently born.
mesh_terms: D000328:Adult; D004314:Down Syndrome / Q000453:epidemiology / Q000209:etiology*; D005260:Female; D006801:Humans; D007047:Hysterosalpingography / Q000009:adverse effects; D010053:Ovary / Q000000981:diagnostic imaging / Q000528:radiation effects; D011247:Pregnancy; D011859:Radiography / Q000009:adverse effects*; D006113:United Kingdom