Parental exposure to x-irradiation and Down's syndrome.
D004314:Down Syndrome / Q000209:etiology*; D005260:Female; D005836:Genitalia, Female / Q000528:radiation effects; D005837:Genitalia, Male / Q000528:radiation effects; D006801:Humans; D008297:Male; D008423:Maternal Age; D010053:Ovary / Q000528:radiation effects; D011247:Pregnancy; D011829:Radiation Dosage; D011830:Radiation Effects; D011859:Radiography / Q000009:adverse effects; D013997:Time Factors