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ObjectiveTo estimate the maternal age‐specific live birth prevalence (in the absence of prenatal diagnosis and selective termination) of trisomy 13 (Patau syndrome) and trisomy 18 (Edwards syndrome) and compare it with that of trisomy 21 (Down syndrome).
MethodsRecords of prenatal and postnatal diagnoses from seven UK regional congenital anomaly registers and two Australian registers covering 4.5...
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