[Genetic epidemiology of chromosome abnormalities].
D000293:Adolescent; D000367:Age Factors; D002648:Child; D002869:Chromosome Aberrations / Q000453:epidemiology / Q000209:etiology / Q000235:genetics*; D025063:Chromosome Disorders; D004314:Down Syndrome; D005260:Female; D006801:Humans; D007564:Japan; D008297:Male; D006113:United Kingdom