Lack of seasonal- or temporal-spatial clustering of Down's syndrome births in Michigan.
D004314:Down Syndrome / Q000453:epidemiology* / Q000209:etiology / Q000235:genetics; D005260:Female; D006801:Humans; D007231:Infant, Newborn; D008423:Maternal Age; D008824:Michigan / Q000453:epidemiology; D011247:Pregnancy; D012621:Seasons; D013029:Space-Time Clustering