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1 entries match Ancient [K01.400.470] · Obstetrics & Reproductive [C13 / G02.403.615] · Genetics & Heredity [K01.900.300]

1938

#4962.1

A clinical and genetic study of 1,280 cases of mental defect.

In this exhaustive study Penrose showed (p. 36) the significance of maternal age in the etiology of Down syndrome.