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Objectives
To investigate by means of a population‐based analysis of a cohort of women who underwent combined first‐trimester screening (CFTS), changes in uptake of invasive prenatal diagnosis according to risk of trisomy 21 (T21) on CFTS, and prevalence and methods for ascertainment of atypical chromosome abnormalities.
Methods
This was a retrospective cohort study using state‐wide prenatal datasets...
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